- Abstract：A propylene-based elastomer (PBE) and calcium phthalate (CaPh) were selected to modify polypropylene (PP) via melt blending. The prepared PP blends exhibited excellent impact toughness and crystalline properties owing to the synergistic effects of PBE and CaPh. The dispersed PBE phase in the PP matrix acted as numerous stress concentrators, initiated shear banding, and impeded the crack propagation. The impact strength of the PP/PBE blends progressively increased with increasing PBE content. CaPh functioned as a β-nucleating agent and effectively induced the formation of a high content of β-crystals in PP. The DSC results indicated that CaPh exhibited high nucleation efficiency, acting as a heterogeneous nucleating agent to improve the crystallization of PP and PBE. With the incorporation of 15 wt% PBE and 0.05 wt% CaPh, the content of β-crystals reached 87.1% and the impact strength of PP enhanced to 50.9 kJ/m2.Keywords：Polypropylene;Propylene-based elastomer;Calcium phthalate;Blend0|0|0
Updated：2026-10-14 - Abstract：Structural and functional diversity of block copolymers can be vastly expanded by combining carbon-chain and heterochain segments. However, options for one-pot controlled synthesis of such hybrid block copolymers remain scarce. Herein, we report a tandem anionic polymerization strategy that addresses this challenge. Classic anionic vinyl-addition polymerization of isoprene or styrene is performed first, followed by end-capping with ethylene oxide to generate a macromolecular lithium alkoxide. A N,N’-disubstituted (thio)urea is then introduced to interact with the alkoxide, creating an ionic initiating/catalytic system through exchange of proton and lithium cation. The in situ generated bifunctional catalytic species allows the ring-opening polymerization (ROP) of the subsequently added ε-caprolactone (CL) to occur with markedly enhanced selectivity. Well-defined hybrid block co- and ter-polymers are obtained even at full CL conversion. Urea with medium acidity (pKa) and structural symmetry is shown optimal mediator to achieve both high efficiency and good control of the ROP step.Keywords：Anionic polymerization;Ring-opening polymerization;Vinyl-addition polymerization;Block copolymer;Polyester2|0|0Updated：2026-10-14
- Abstract：While the effects of chain entanglement on the mechanical properties of polymer systems have been extensively studied, it remains a major challenge to further clarify the deformation and motion of the entangled polymers at the molecular scale. Herein, one-dimensional and two-dimensional long-range ordered entangled polymers, along with a non-entangled control, are constructed by exploiting the bonding and extended conformations of dative B―N bonds in identical monomers to drive polymerization, thereby providing a powerful platform to investigate the evolution mechanism of chain entanglements under stress stimuli and their impact on the mechanical properties of materials. Combined mechanical measurements and density functional theory calculations reveal that polymer mechanics are not only profoundly influenced by the presence of chain entanglements but also strongly dictated by the specific entanglement topology. Compared with one-dimensional entangled polymers containing a limited number of intertwined chains, two-dimensional entangled polymers, in which numerous chains interweave within a planar network, demonstrate markedly enhanced resistance to deformation. This study elucidates the role of entanglements in the mechanical properties of polymers, providing new insights into the relationship between polymer entanglement structures and material performance.Keywords：Entangled polymers;Mechanical properties;Single crystals;Supramolecular chemistry2|0|0Updated：2026-10-14
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Flexible Photonic Films Based on Cellulose Nanocrystals with Temperature-responsive Structural Color
Abstract：Stimuli-responsive photonic materials based on cellulose nanocrystals (CNCs) have attracted considerable interest for their applications in sensing, anti-counterfeiting, and smart windows. However, most existing thermo-responsive CNC composites rely on the lower critical solution temperature (LCST) behavior of polymers, such as poly(N-isopropylacrylamide), which often restricts the operating temperature range and results in discontinuous or hysteretic optical responses. Herein, we report a new strategy that avoids LCST-driven bulk volume transitions by introducing a cholesterol derivative (Chol-6) as a thermo-responsive steric regulator through its incorporation into a Chol-6-functionalized polyacrylamide (PAM) network within the CNC chiral nematic matrix. A water-soluble prepolymer (PAMC4) bearing Chol-6 side chains was synthesized and co-assembled with glycerol and CNCs via evaporation-induced self-assembly (EISA) to produce flexible structurally colored films. Glycerol serves as a plasticizer to overcome the brittleness of pure CNC films and as a hygroscopic agent to facilitate solvent-mediated structural adjustment rather than directly enhancing reversibility. By systematically adjusting the Chol-6/glycerol ratio, the helical pitch and the corresponding structural color can be continuously tuned from blue to red. The optimized 8CNCs-2PAMC4/G10 film showed a 64 nm redshift of the reflection maximum upon heating from 25 °C to 80 °C, significantly exceeding that of the Chol-6-free control. Mechanistic studies revealed that the thermal response is primarily governed by the steric regulation of the Chol-6 side groups within the PAMC4 network, which modulates hydrogen-bond-mediated interactions and promotes relaxation-driven helical pitch expansion, while the intrinsic chirality of Chol-6 contributes mainly to the formation and preservation of the chiral organization. This study reveals the unexplored role of chiral compounds in CNC-based photonic materials as thermo-responsive steric regulators beyond conventional chiral twist inducers, providing a new design strategy for tunable thermo-responsive photonic systems without relying primarily on polymer volume phase transitions.Keywords：Cellulose nanocrystals;Chiral nematic liquid crystal;Photonic film;Thermochromism;Steric hindrance3|0|0Updated：2026-10-14 - Abstract：Organic semiconductors (OSCs) have emerged as a compelling materials platform for spintronic research due to their light-element composition generally gives rise to weak spin–orbit coupling and hyperfine interactions, thereby enabling long spin relaxation time and spin diffusion length even at room temperature. These features have stimulated extensive interest in spin transport dynamics in OSCs, and rapid progress in both experimental characterization and theoretical modeling has substantially deepened on the understanding of spin transport, spin relaxation, and spin-dependent interactions in OSCs. In this Review, we provide a comprehensive overview of recent advances in spin transport dynamics in OSCs, with emphasis on spin transport characteristics, spin relaxation strengths and mechanisms in organic films, and spin transport processes in representative device architectures. Finally, we outline the key challenges that remain and highlight emerging opportunities for advancing the fundamental understanding and practical applications of organic spintronics.Keywords：Organic spintronics;Organic semiconductor;Spin transport;Spin relaxation14|6|0Updated：2026-10-10
- Abstract：Although shape-memory polymers show significant potential in soft robotics and flexible electronics, their practical deployment is often limited by conventional bulk thermal triggering, which lacks spatiotemporal resolution and rapid response capabilities. To address this limitation, by engineered a class of triple-responsive (thermal/UV/NIR) shape-memory polyurethanes (Hn-SPMUs) via a “dynamic-topology-coupling” strategy. Specifically, photo-reversible coumarin moieties were covalently tethered onto a stable epoxy-amine polyurethane skeleton. By systematically varying the alkyl spacer length, a critical structure-property correlation was elucidated: elongating the flexible spacer effectively alleviated local steric hindrance, thereby accelerating the photochemical dimerization kinetics and increasing the topological crosslinking density. Consequently, the optimized Hn-SPMUs decoupled network stability from dynamic responsiveness, achieving excellent multimodal actuation: rapid global thermal recovery at a mild 45 °C, rapid non-contact NIR actuation within 4 s driven by intrinsic photothermal conversion, and precise spatiotemporal 3D programming via localized 365 nm UV irradiation. Furthermore, by leveraging the catalyst-free, reversible [2+2] cycloaddition of coumarin units, the engineered network demonstrated on-demand photothermal self-healing and established a reliable platform for multi-cycle “write-store-erase” optical data encryption. This synergistic design paradigm provides a versatile material framework for untethered soft actuators and advanced anticounterfeiting technologies.Keywords：Shape memory polyurethanes;Coumarin;Light/thermal/IR triple-response;Spatiotemporal programming;Smart materials18|10|0Updated：2026-10-10
- Abstract：Polyurethane (PU) foams are extensively utilized in various industries owing to their lightweight, excellent thermal insulation, and robust mechanical properties. However, their widespread use generates significant quantities of waste, which poses serious environmental and disposal challenges. In this study, rigid PU foam was effectively depolymerized via microwave-assisted glycolysis, using 2-methyl-1,3-propanediol (MP-diol) as the glycolysis agent and sodium hydroxide (NaOH) as the catalyst. The depolymerization process was systematically optimized by varying the reactant ratio, catalyst concentration, reaction temperature, and microwave power. The resulting oligomeric product (PUF-O) was characterized by physical, chemical, and spectroscopic analyses. Subsequently, a series of polyester polyols (PEs) was synthesized by partially and fully replacing neopentyl glycol with an oligomeric product in formulations containing adipic acid and phthalic anhydride. These PEs further reacted with commercial polyisocyanates to form polyurethane coatings. Characterisation was conducted to analyse the optical, mechanical, chemical, and anticorrosive properties of the cured films were characterized. The PUF-O-based polyols exhibited performance comparable to those synthesized using conventional raw materials, demonstrating the feasibility of incorporating recycled PU foam into high-performance coating systems. This work not only provides a sustainable strategy for recycling PU waste but also offers a viable route to value-added products.Keywords：Polyurethane rigid foam;Glycolysis;Microwave assisted;2-Methyl-1,3-propanediol (MP-diol);Polyurethane coatings21|9|0Updated：2026-10-10
- Abstract：With the rapid development of lightweighting and information technology, there is an urgent need for lightweight, high-strength, and multifunctional polymer-based composite films that integrate electromagnetic interference (EMI) shielding and thermal management capabilities. However, maintaining strength and functional stability in harsh environments still faces significant challenges. A carbon nanotube/polyetheretherketone (CNT/PEEK) composite film was fabricated via vacuum-assisted impregnation and wet-pressing techniques. By adjusting the molecular weight of the PEEK matrix, the composite film attained a high tensile strength of 218.42 MPa. This study elucidates a dual-competition mechanism during the impregnation of polymer solutions with varying molecular weights. The highly conductive carbon nanotube (CNT) film, serving as the functional filler, endows the CNT/PEEK composite film with high EMI shielding effectiveness (SET of 47 dB at 10 µm, specific shielding effectiveness per thickness (SE/t) of 4700 dB/mm) and outstanding dual-conversion capabilities (electrothermal: 3 V, 79 °C; photothermal: 2.0 W/cm2, 178 °C). Furthermore, the semi-crystalline nature of PEEK ensures that the composite film maintains excellent stability even after undergoing high/low-temperature impacts and long-term erosion under acid/alkali corrosive conditions. The high-strength CNT/PEEK composite film shows promise for applications, such as EMI shielding and thermal management in harsh environments.Keywords：Molecular weight regulation;High strength;Electromagnetic interference (EMI) shielding;Thermal management;Performance stability7|5|0Updated：2026-10-10
- Abstract：Emerging and legacy contaminants, including micro (nano) plastics, perfluoroalkyl and polyfluoroalkyl substances (PFAS), dyes, and antibiotics, are pervasive in aquatic environments and seriously threaten both ecosystems and human health. In this study, we developed a sustainable water purification system using renewable cellulose to rapidly remove pollutants through an integrated flocculation-filtration approach. By controlling precipitation dynamics, we engineered cationic cellulose microgels (CNFN-N+) with nanofibrous networks as flocculants; via air-spinning, we fabricated cationic lignocellulose microfibers (CLCMF) into functional filter papers, creating a dual-function biomass solution for efficient contaminant removal. Featuring a three-dimensional nanofibrous network, CNFN-N+ actively entrapped and mobilized aquatic pollutants while establishing adsorption bridges between contaminants through synergistic electrostatic/hydrogen-bond interactions, driving their agglomeration into larger clusters. CLCMF can efficiently intercept various pollutants in water through the synergistic effects of electrostatic interactions, hydrogen-bond interactions, and physical blocking effects. The combination of CNFN-N+ and CLCMF can remove 99.99% of micro (nano) plastics and anionic dyes and has a high removal rate for PFAS and antibiotics in water. This cellulose-based "flocculation-filtration" cascade strategy provides an efficient and fast approach for water purification.Keywords：Plastic pollution;Water treatment;Cellulose;Filtration;Perfluoroalkyl and polyfluoroalkyl substances6|5|0Updated：2026-10-10
- Abstract：Thermoplastic polyimide serves as a promising high-performance polymer matrix for fiber-reinforced composites, yet its high melt viscosity severely impairs fiber wetting and filler dispersion, limiting the high-temperature service performance. In this work, we propose and validate a universal and controllable fabrication strategy using quartz fibers and a pyromellitic dianhydride/4,4’-oxydianiline (PMDA/ODA)-type polyimide as a model system. Our approachinvolves significantly diluting the poly(amic acid) (PAA) solution to reduce viscosity and improve fiber wetting, combined with the intercalation of PAA films to enhance laminar interlaminar adhesion within prepreg. Cross-sectional scanning electron microscopy (SEM) reveals a dense, defect-free microstructure with no evidence of voids or delamination. Following thermal aging at 300 °C for 504 h, the composite exhibit no macroscopic damage and retain 70%–75% of their initial mechanical properties. To achieve high filler loading, multi-walled carbon nanotube (MWCNT)/Fe3O4 (at a weight ratio of polyimide (PI):MWCNT:Fe3O4=10:1:5) are pre-dispersed in pure solvent, resulting in excellent microwave absorption (RLmin= –55.07 dB, EAB=1.9 GHz at 1.5 mm) alongside high thermal stability. The process method allows precise control over composite thickness and resin distribution by adjusting the number of prepreg layers and the amount and placement of PAA film. This study demonstrates that thermoplastic polyimide can act as a high-performance polymer matrix, enabling advanced fiber-reinforced composites with exceptional long-term thermo-oxidative stability for harsh high-temperature polymer composite applications.Keywords：Thermoplastic polyimide;Fiber-reinforced composite;Process;Microwave absorption;Thermal aging8|24|0Updated：2026-10-10
- Abstract：Poly(phenylene oxide) (PPO), an engineering plastic with excellent comprehensive performance, faces significant processing challenges owing to its high melt viscosity, which severely limits its large-scale applications. The introduction of polyamide 6 (PA6) effectively improved its processability, but inevitably compromised the inherent heat resistance of PPO. In this study, high-modulus, heat-resistant, and electromagnetically shielded carbon fiber (CF)-reinforced PPO/PA6 (PPO/PA6/CF) microcellular composites were fabricated using chemical foaming injection molding. The effects of CF content on the foaming behavior, thermal properties, mechanical properties, and electromagnetic interference (EMI) shielding performance of the composites were systematically investigated. The results indicated that when the CF content was 5 wt%, the PPO/PA6/CF microcellular composite exhibited the optimal cell structure with an average cell diameter of 49.44 μm and a cell density of 3.48×106 cells/cm3. In addition, the synergistic effect of the fiber network structure and improved crystallinity significantly enhanced the heat resistance of the PPO/PA6/CF foams. Compared with the PPO/PA6 foam, the PPO/PA6/CF foams exhibited an increase in heat deflection temperature (HDT) of 84.7 °C, reaching 181.2 °C, along with a flexural modulus as high as 8509 .16 MPa and an EMI shielding effectiveness of 37.02 dB, demonstrating remarkable multifunctionality. This study provides a feasible pathway for the efficient and scalable production of lightweight PPO-based composites with superior thermal deformation resistance and EMI shielding performance.Keywords：Poly(phenylene oxide)/polyamide 6 (PPO/PA6) composites;Carbon fiber;Chemical foaming injection molding;Heat deflection temperature;Electromagnetic interference (EMI) shielding14|24|0Updated：2026-10-10
- Abstract：The utilization of dimethyl 2,2'-bifuran-5,5'-dicarboxylate (BFDCE) as a rigid unit to prepare biomass-derived polyesters has garnered substantial interest, owing to its exceptional thermal stability and excellent mechanical performance. To date, the conformational ordering for crystallization of bifuran-based polyesters is still unclear. Herein, a series of bifuran-based polyesters (PBFm, where m=5–9 represents the number of methylene groups in the aliphatic diols) is synthesized via melt polycondensation using BFDCE and diols. Their crystallization behavior and mechanical performance show a distinct odd-even effect. Despite the restricted chain mobility induced by the rigid bifuran units, the even-numbered PBF6 and PBF8 with a well-defined spherulitic structure exhibit a high crystallinity of 83% and 73%, respectively. In contrast, the odd-numbered PBF5, PBF7, and PBF9 remain amorphous upon melt crystallization. As a result, the crystallized samples show superior tensile strength, while the amorphous counterparts exhibit remarkable ductility. Specifically, PBF6 achieves an exceptional elongation at break of 466% coupled with a tensile strength of 43.7 MPa. These bifuran-based polyesters can serve as sustainable, high-performance alternatives to petroleum-derived polymers, with potential applications in automotive components and other fields requiring tunable material properties.Keywords：Bifuran polyesters;Odd-even effect;Crystallization;Molecular conformation10|14|0Updated：2026-10-10
- Abstract：Donor-acceptor conjugated polymers are vital materials for organic electronics, but traditional thermally driven Stille polymerization suffers from unavoidable homocoupling defects and batch variations. In this study, we developed an efficient room-temperature Stille catalytic system using P(t-Bu)3Pd(crotyl)Cl as the precatalyst and CsF as the base. This method displays broad substrate universality, affording various conjugated polymers with fewer homocoupling fragments than the traditional methods. This work provides a mild, general route toward high-performance, regio-regular conjugated polymers.Keywords：Room-temperature Stille polymerization;Conjugated polymers;Homocoupling;Organic solar cells36|64|0Updated：2026-09-30
- Abstract：The fabrication of functional cellulose engineering solids holds great promise for sustainable optics but is severely hindered by the processing paradox imposed by its recalcitrant hydrogen-bonded architecture. To overcome this bottleneck, an orchestrated sequential covalent molecular locking strategy has been reported to transition dynamic cellulosic eutectic melts into robust luminescent glass. Utilizing a cellulose acetate butyrate/thymol eutectic plasticization platform, primary anchoring was implemented via isocyanate chemistry, followed by in situ 3D crosslinking. This topological reconfiguration induces microscopic network densification and network vitrification, leading to enhanced tensile strength (from about 10.2 MPa to about 55.3 MPa), >90% transparency, and high hydrolytic stability. Mechanistically, the dense network establishes extreme space confinement, triggering the restriction of molecular motion to suppress nonradiative decay and activate efficient solid-state luminescence with programmable multicolor outputs. This deconstruction–locking–activation approach offers a versatile chemical method for developing next-generation high-performance biomass-derived functional materials.Keywords：Cellulosic eutectic systems;Sequential covalent locking;Restriction of molecular motion;Luminescent glass;High-strength31|40|0Updated：2026-09-30
- Abstract：Donor-node-acceptor (D-n-A) systems based on perylene bisimide (PBI) have emerged as versatile platforms for organic electronics and quantum materials. In this architecture, a non-conjugated node, typically an imide nitrogen, breaks conjugation between the donor and acceptor, spatially separating the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) on the two components. This decoupling renders p- and n-type doping independent and precisely controllable, thereby overcoming the fundamental limitations of conventional conjugated polymers. This review systematically summarizes the recent progress in D-n-A systems from small molecules to functional polymers. In PBI dyads and triads, node-induced exciton coupling enables tunable photophysics, whereas molecular conformation controls the competition between fluorescence and symmetry-breaking charge separation. The cascade energy-level alignment in the D-n-A1-n-A2 architectures yields long-lived charge-separated states by spatially separating the radical ion pair. Covalent linking of stable radicals (TEMPO, TTM) to PBI or naphthalene bisimide (NBI) via nodes allows efficient photoinduced intersystem crossing and the formation of quartet states (S=3/2), promising for molecular qubits. In the polymer domain, D-n-A polymers with a small fraction of PBI acceptors exhibit photoenhanced hole transportation, serving as hole-transporting layers for photodetectors. Bipolar polymers with a D:A ratio of approximately 1:1 demonstrate ambipolar charge transport and storage and have been successfully applied in flexible supercapacitors, lithium-ion batteries, and multicolor electrochromic devices. Finally, the outlook highlights future directions: precise control of donor-acceptor coupling, optimization of polymer morphology, translation to stable solid-state systems, and multifunctional integration of electrochemistry with spin quantum properties.Keywords：Bipolar;Charge separation;Donor-node-acceptor polymer;Perylene bisimide;Photoinduced electron transfer30|28|0Updated：2026-09-29
- Abstract：Achieving optimal active-layer morphology in organic solar cells (OSCs) without volatile additives is critical for long-term operational stability. This study introduces a rational molecular design strategy utilizing chalcogen-engineered two-dimensional (2D) side chains to intrinsically regulate non-fullerene acceptor (NFA) packing. We synthesized three novel NFAs, BTP-OTh, BTP-STh, and BTP-SeTh, to systematically decode the impact of heteroatomic polarizability on device performance. The incorporation of highly polarizable selenium atoms in BTP-SeTh effectively enhances the local dielectric constant (εr) and suppresses the exciton binding energy (Eb) through intensified dielectric screening. Consequently, deploying BTP-SeTh as a morphology-regulating ternary component in the D18/L8-BO system yields an exceptional power conversion efficiency (PCE) of 20.58% via an entirely additive-free fabrication process. This work establishes chalcogen-substituted 2D side chains as a robust molecular blueprint for developing high-performance, intrinsically stable, and additive-free organic photovoltaics.Keywords：Organic solar cells;Non-fullerene acceptors;Chalcogen atom engineering;Morphology control;Additive-free;Dielectric constant28|0|0Updated：2026-09-29
- Abstract：Integrating photoresponsive components into superhydrophobic surfaces remains a challenge because functional species often disrupt the hierarchical micro/nanostructures required for superhydrophobicity. In particular, intrinsically hydrophilic polyoxometalates (POMs) are difficult to incorporate into low-surface-energy systems without compromising their structural integrity and wetting performance. Herein, a fluoropolymer porous coating of phosphomolybdic acid (FPPC@PMA) was fabricated via a high-internal-phase emulsion (HIPE) templating strategy, enabling the simultaneous immobilization of hydrophilic POMs and construction of a hierarchical porous fluoropolymer framework. The resulting FPPC@PMA coating exhibited excellent superhydrophobicity with a water contact angle of 152° and remarkable mechanical durability in sandpaper abrasion and tape-peeling tests. Owing to the redox activity of PMA, the composite also displays a sensitive and reversible photochromic response upon ultraviolet irradiation, suggesting its potential applications in ultraviolet (UV) monitoring and information encryption. Molecular dynamics simulations further elucidated the interfacial interactions between the polymer matrix and phosphomolybdic acid clusters, providing theoretical insights into the structural stability of the composite system. This work offers an effective strategy for integrating hydrophilic photoresponsive species into superhydrophobic architectures while maintaining their structural integrity and functionality.Keywords：HIPE-templated coatings;Multifunctional fluoropolymers;Superhydrophobic interfaces;Photochromism25|13|0Updated：2026-09-29
- Abstract：Poly(lactic acid) (PLA) is a renewable polyester material with excellent properties, such as processability, biocompatibility, and biodegradability, and is widely used in packaging and medical applications. However, neat PLA has the performance limitations of high brittleness and poor toughness, strongly restricting its practical use. In this study, three poly(ethylene glycol) (PEG)-based telechelic polymers were synthesized with different microstructures: linear epoxidized poly(ethylene glycol) (linear EPEG), 4-arm star-shaped epoxidized poly(ethylene glycol) (4A-EPEG), and 4-arm star-shaped poly(lactic acid-glycolic acid)-epoxidized polyethylene glycol (4A-PLGA-EPEG). These telechelic polymers that take the reactive epoxy groups on the terminals of the chains endowed the reactive compounding with the PLA matrix to achieve the mechanical enhancement of the blends. At a low loading level (3 wt%), the introduction of 4A-PLGA-EPEG significantly improved the toughness of the PLA-based blends with a substantial increase in elongation at break of 107.43% compared to only 3.84% for the neat PLA material. In contrast to linear EPEG and 4A-EPEG, the 4A-PLGA-EPEG copolymer served as a mechanical toughening agent because of its enhanced compatibility and the formation of topological entanglements with the polymeric matrix in the blends. The calculation of the efficiency factor (η) quantified the improvement in the microstructure stability and stress transfer efficiency of blends derived from the chain entanglements of the added copolymer, and molecular simulations further confirmed the formation of a micro-topological structure by reactive compounding in PLA-based blends.Keywords：Poly(lactic acid);Telechelic copolymer;Blends;Molecular simulation12|9|0Updated：2026-09-29
- Abstract：A tough and self-healable Tb3+-and Sm3+-containing thermo-fluorochromic (TFC-Sm/Tb) elastomer with highly sensitive and tunable temperature-responsive emission was developed. The elastomer was dynamically cross-linked by Tb3+ and Sm3+ ions through coordination with the COOH groups of the carboxylated nitrile butadiene chains, with 1,10-phenanthroline acting as the ancillary ligand. Mechanical investigations reveal that Tb3+ cross-linking is more effective in enhancing toughness. The TFC-Sm/Tb elastomer also has high self-healing efficiency and provides effective adhesion to the metal surface. Fluorescence spectroscopic studies showed that Tb3+ mainly displays an intense spin-forbidden interconfigurational 4f8→4f75d1 excitation transition, whereas Sm3+ excitation is dominated by a broad Phen-to-Sm3+ energy transfer band from 250 nm to 380 nm. By adjusting the excitation wavelength or Sm3+/Tb3+ molar ratio, the emission color can be easily tuned from green to red. Notably, the Tb3+ emission is highly temperature-sensitive and undergoes pronounced thermal quenching upon heating, while the Sm3+ emission remains nearly invariant from 25 °C to 100 °C. This distinct contrast enabled highly sensitive thermo-fluorochromism, yielding a high relative thermal sensitivity of 8.6 (%)/K. As a proof of concept, our work paves the way for the fabrication of thermofluorochromic materials with potential applications in luminescent textiles, anti-counterfeiting, and temperature-sensing fluorochromic coatings.Keywords：Polymeric elastomer;Thermo-fluorochromism;Dynamic coordination;Rare earth;Stimuli-responsiveness13|4|0Updated：2026-09-29
- Abstract：The incorporation of nucleating agents is widely regarded as an effective and practical strategy for overcoming the inherently slow crystallization rate of poly(L-lactide) (PLLA). While talc has long been used to promote PLLA crystallization, primarily attributed to lattice matching between its (002) crystal facet and PLLA crystals, the underlying nucleation mechanism remains inadequately understood. In this work, we employed exfoliated nanotalc with a high proportion of exposed (002) nucleation-active facets to enhance the crystallinity and accelerate the crystallization rate of PLLA and reveal new molecular-level insights into its nucleating mechanism. Compared to conventional talc, nanotalc significantly accelerated PLLA crystallization, increasing its crystallinity from 40.0% to 49.5% and reducing the half-crystallization time from 2.21 min to 1.18 min. Correlative in situ high-resolution transmission electron microscopy (TEM) and atomic force microscopy (AFM) established a definitive interfacial orientation relationship, showing that PLLA preferentially aligns along the talc [310] direction. Combined with in situ characterization and molecular dynamics simulations, these results demonstrate that the nucleation of PLLA is driven not only by lattice matching but also by steric confinement of PLLA methyl groups within the six-membered rings of SiO4 tetrahedra on the talc facet, which strengthens interfacial interactions and facilitates nucleation. This study provides a molecular-level understanding of heterogeneous polymer nucleation and offers guiding principles for the rational design of high-efficiency nucleating agents.Keywords：Poly(L-lactide) (PLLA);Nanotalc;Nucleation-active facets;Crystal orientation;Steric confinement effect22|5|0Updated：2026-09-29
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