- Abstract：A composition-gradient study of benzocyclobutene/polar polynorbornene dielectric films reveals that continuous low-loss network formation, rather than higher polar-group content, is critical for high-efficiency capacitive energy storage at 150–250 °C. Herein, composition-gradient B(xBCB-yP) films were prepared by blending and thermally curing divinyltetramethyldisiloxane-bis(benzocyclobutene) prepolymer (pre-DVS-BCB) with sulfone-functionalized polynorbornene prepolymer (pre-P(exo-p-sulfone)), enabling the roles of polar groups, local packing, network continuity, and charge transport to be compared. The sulfone-containing component increased the high-field effective permittivity, but intermediate blend compositions developed local packing heterogeneity, nanoscale chemical-response variation, enhanced leakage current, and reduced breakdown reliability. In contrast, B(100BCB-0P) maintained characteristic breakdown strengths of 780, 698, and 671 MV·m–1 at 150, 200, and 250 °C, respectively, and delivered maximum discharge energy densities of 5.69, 5.19, and 3.50 J·cm–3 at a charge-discharge efficiency (η) above 90%. These results indicate that high-temperature polymer dielectrics require continuous, low-loss network formation rather than simply increased polar-group content.Keywords：Polymer dielectrics;Benzocyclobutene;Polynorbornene;High-temperature capacitive energy storage2|0|0
Updated：2026-10-23 - Abstract：The development of NIR-II fluorescence imaging agents with high aqueous solubility and prolonged circulation time remains challenging, primarily because of the intrinsic hydrophobicity of the widely used small-molecule fluorophores. Herein, we rationally designed an aza-boron dipyrromethene (BODIPY)-based atom transfer radical polymerization (ATRP) initiator and employed it to polymerize the zwitterionic monomer, 2-methacryloyloxyethyl phosphorylcholine (MCP), yielding a water-soluble polyzwitterionic NIR-II probe, designated as JNBDP-PMCP
64 . The resulting JNBDP-PMCP64 exhibited excellent biocompatibility, remarkable chemical/photostability, and a high NIR-II fluorescence quantum yield (Φf>1000 nm=0.032%). Furthermore, its prolonged blood circulation half-life (t1/2β=11.8 h) enables high-fidelity vascular imaging with a superior signal-to-background ratio (SBR). Collectively, this study provides a robust strategy to overcome the solubility and biocompatibility limitations of NIR-II fluorophores, paving the way for advanced bioimaging applications.Keywords：NIR-II probe;Polyzwitterionic;Long circulation;Bioimaging2|0|0Updated：2026-10-23 - Abstract：Hyperuricemia is a major risk factor for gout, renal injury, and cardiovascular disease, necessitating effective control of serum uric acid levels. Existing therapies face challenges such as limited efficacy, renal toxicity, and dosing complexities. Urate oxidase (UOx) offers a potent enzymatic degradation strategy but suffers from in vivo persistence, immunogenicity, and the generation of the harmful byproduct hydrogen peroxide (H2O2), which limits its clinical utility. Here we report a dual-functional polymeric vesicle that functions as a microreactor for UOx delivery. The vesicular membrane was designed to reduce the direct exposure of encapsulated UOx to immune components, while thioether groups embedded within the membrane rapidly scavenge H2O2 generated in situ. This integrated design enables simultaneous uric acid degradation and byproduct elimination without introducing additional enzymes. UOx@vesicle retained 78.1% of the enzymatic activity of free UOx. In hyperuricemic mice, UOx@vesicle maintained a significant uric acid-lowering effect for up to 73 h, approximately 2 days longer than free UOx, while attenuating immune responses and decreasing serum biochemical markers associated with hepatic and renal dysfunction. This work provides a general strategy for enhancing the safety and efficacy of enzyme-based therapeutics for hyperuricemia and other reactive oxygen species-related diseases.Keywords：Hyperuricemia;Polymer vesicles;Urate oxidase;Self-assembly2|0|0Updated：2026-10-23
- Abstract：High-performance solid-state electrolytes (SSEs) are essential for safe and high-energy-density lithium metal batteries. Polymer electrolytes are promising candidates owing to their flexibility and favorable interfacial contact; however, they inherently suffer from insufficient ionic conductivity, which severely limits their practical application. Constructing continuous ion transport pathways within the polymer matrix has proven effective in enhancing ionic conductivity, yet achieving controllable and uniform construction of these pathways remains a significant challenge. Herein, we report a universally applicable and facile electric-field-induced alignment strategy to fabricate a composite solid polymer electrolyte with vertically oriented Al2O3 nanorods. The oriented nanorods establish continuous filler-polymer interfaces that function as rapid Li+ transport pathways, simultaneously enhancing ionic conductivity (75% reduction in full-cell impedance) and mechanical robustness. Furthermore, the oriented structure promotes stable solid electrolyte interphase formation, improving interfacial stability. The oriented electrolyte delivers a reversible capacity of 142.7 mAh·g–1 after 220 cycles at 60 °C and 0.1 C, surpassing the non-oriented counterpart (133.4 mAh·g–1).Keywords：Solid-state electrolyte;Electric-field-induced orientation;Lithium batteries;Al2O3 nanorods15|10|0Updated：2026-10-21
- Abstract：The advancement of organic electronics relies critically on the development of n-type π-conjugated polymers. Herein, we report two cyano-functionalized benzoselenadiazole (CNBSz)-based conjugated polymers, Th-CNBSz and Se-CNBSz, incorporating diketopyrrolopyrrole (DPP) unit flanked by thiophene or selenophene moieties. The introduction of electron-deficient cyano substituents and a dual-acceptor backbone enables deep LUMO energy levels of down to −4.24 eV, allowing electron injection and n-doping. Meanwhile, the dual-acceptor framework promotes polaron delocalization along the polymer backbone. Density functional theory calculations reveal that selenophene substitution enhances backbone planarity via multiple synergistic intramolecular noncovalent interactions, whereas thiophene substitution imparts greater conformational flexibility, which facilitates backbone planarization in the solid state and improves molecular packing. As a result, despite its less planar backbone, Th-CNBSz exhibits superior electron mobility (0.26 cm2·V−1·s−1) and consequently delivers a high electrical conductivity of 19.2 S·cm−1 and a power factor of 27.6 μW·m−1·K−2 upon n-doping.Keywords：Conjugated polymers;n-Type transport;Organic electronics;n-Doping;Thermoelectrics12|3|0Updated：2026-10-21
- Abstract：Glass-fiber-reinforced polymer composites (GFRCs) have a wide range of applications. However, under complex service conditions, GFRCs are prone to internal damage that is not readily detectable, thereby posing potential safety risks. In this study, camphoric acid diglycidyl ester (CADE) was synthesized from bio-based camphoric acid (CPA) and subsequently cured with 4,4′-diaminodiphenyl disulfide (APD) to construct a CADE-APD vitrimer featuring a dual dynamic network based on disulfide and β-hydroxy ester bonds. After compositing with glass fibers, the resulting composite exhibited excellent mechanical performance, recyclability, UV shielding, and damage self-reporting capability. Benefiting from disulfide exchange and transesterification reactions, the vitrimer network demonstrates rapid stress relaxation, with a relaxation time of 50 s and an activation energy (Ea) of 74.66 kJ/mol. Notably, mechanical damage induces disulfide bond cleavage, generating thiyl radicals that result in a visible green color change, enabling real-time damage. The composites could be rapidly degraded in β-mercaptoethanol via thiol-disulfide exchange. Owing to the introduction of a rigid five-membered ring derived from camphoric acid, both the vitrimers and GFRCs exhibit excellent mechanical properties. This study provides a new approach for the preparation of multifunctional bio-based glass-fiber-reinforced polymer materials.Keywords：Glass-fiber-reinforced polymer;Damage self-reporting;UV-shielding;Recyclable;High performance21|9|0Updated：2026-10-19
- Abstract：The number of polymer chains irreversibly adsorbed onto a solid substrate decreases systematically in films thinner than roughly ten macromolecular radii of gyration, an effect attributed to the weakening of the van der Waals interaction under nanoconfinement. Here, we demonstrate that this phenomenology has a precise spectral signature. Within our recently developed framework, the adsorption kinetics are described as a superposition of thermally activated processes, and reducing the film thickness exclusively suppresses the weight of the loop-mediated component of the rate spectrum, leaving the slowest and fastest accessible adsorption rates invariant. The apparent growth rate in the logarithmic regime decreased in proportion to the adsorbed amount and, through the effective Hamaker constant, to the film geometry. Therefore, the rate spectrum is a topological property of the polymer melt, while the amount adsorbed through each pathway is set by the depth of the interfacial potential. Temperature and film geometry act as orthogonal control parameters, tuning the kinetics and adsorbed amount independently, which provides a microscopic basis for the rational design of adsorbed polymer layers.Keywords：Polymer adsorption;Nanoconfinement;Adsorption kinetics;Rate spectrum;Thin films8|12|0Updated：2026-10-19
- Abstract：Elastin-like polypeptide (ELP) hydrogels are a class of biomaterials precisely encoded through genetic engineering. Owing to their excellent biocompatibility, precisely tunable thermoresponsive behavior, and favorable biodegradability, they hold great promise in the biomedical field. This review systematically summarizes the core design strategies of ELP hydrogels and their associated advances in cellular and biomedical applications. The discussion begins with an overview of the diverse physicochemical crosslinking strategies underlying the formation of ELP hydrogel networks. It then highlights the design of biomimetic extracellular matrices through the integration of functional domains. This approach promotes the application of ELP hydrogels in 3D cell culture and tissue engineering, such as cartilage and vascular regeneration. The review further examines applied research in cutting-edge fields, such as drug delivery, elucidating how the integration of material properties with biological functions can provide innovative solutions for complex tissue repair and regenerative medicine. Finally, this review offers a systematic theoretical reference and design rationale by discussing the future development of integrated ELP-based biomaterial platforms with dynamic, intelligent responsiveness and multifunctional domain capabilities.Keywords：Elastin-like polypeptide (ELP) hydrogel;Crosslinking strategies;Cell culture;Tissue engineering;Regenerative medicine17|8|0Updated：2026-10-19
- 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;Blend41|28|0Updated：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;Polyester47|30|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 chemistry40|28|0Updated：2026-10-14
-
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 hindrance20|9|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 relaxation40|21|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 materials30|17|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 coatings34|38|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 stability22|29|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 substances21|32|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 aging20|46|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) shielding27|51|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 conformation25|40|0Updated：2026-10-10
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