College of Chemistry, Chemical Engineering and Materials Science, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Soochow University, Suzhou 215123, China
phni@suda.edu.cn
收稿:2019-12-28,
修回:2020-2-12,
录用:2020-2-17,
网络首发:2020-04-20,
纸质出版:2020-09
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Che, K. M.; Zhang, M. Z.; He, J. L.; Ni, P. H. Polyphosphoester-modified cellulose nanocrystals for stabilizing pickering emulsion polymerization of styrene. Chinese J. Polym. Sci. 2020, 38, 921–931
Kun-Ming Che, Ming-Zu Zhang, Jin-Lin He, et al. Polyphosphoester-modified Cellulose Nanocrystals for Stabilizing Pickering Emulsion Polymerization of Styrene[J]. Chinese Journal of Polymer Science, 2020, 38(9): 921-931.
Che, K. M.; Zhang, M. Z.; He, J. L.; Ni, P. H. Polyphosphoester-modified cellulose nanocrystals for stabilizing pickering emulsion polymerization of styrene. Chinese J. Polym. Sci. 2020, 38, 921–931 DOI: 10.1007/s10118-020-2404-z.
Kun-Ming Che, Ming-Zu Zhang, Jin-Lin He, et al. Polyphosphoester-modified Cellulose Nanocrystals for Stabilizing Pickering Emulsion Polymerization of Styrene[J]. Chinese Journal of Polymer Science, 2020, 38(9): 921-931. DOI: 10.1007/s10118-020-2404-z.
The structure and properties of functional nanoparticles are important for stabilizing Pickering emulsion polymerization. Recently
cellulose nanocrystals (CNCs) are increasingly favored as a bio-based stabilizer for Pickering emulsions. In this study
we reported a novel functionalized polyphosphoester-grafted CNCs for the stabilization of oil-in-water Pickering emulsions and the emulsion polymerization of styrene. First
polyphosphoester containing an amino group at one end of the chain
abbreviated as PBYP-NH
2
was prepared by ring-opening polymerization (ROP) and hydrolysis reaction
wherein PBYP represents poly[2-(but-3-yn-1-yloxy)-2-oxo-1
3
2-dioxaphospholane]. Subsequently
CNC-COOH was obtained
via
2
2
6
6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation of CNCs. The functionalized nanocrystals CNC-PBYP-COOH with carboxyl groups and polyphosphoester on the surface were obtained by the amidation reaction of PBYP-NH
2
with CNC-COOH. Finally
we used CNC-PBYP-COOH as sole particle emulsifiers to stabilize styrene-in-water Pickering emulsions and studied its effects on the emulsions in details by using dynamic light scattering (DLS). The results indicated that the properties of these emulsions depended on the concentration of hydrophobically modified CNCs
volume ratios of oil to water
and pH values. The modified CNCs had higher ability to stabilize the styrene-in-water emulsions relative to the unmodified CNCs
and a stable oil-in-water (o/w) Pickering emulsion with diameter of hundreds of nanometers could be obtained. The resulting emulsions could be polymerized to yield nanosized latexes. The polyphosphoester-modified CNCs as green particle emulsifiers can efficiently stabilize nanoemulsions and latexes
which would promote the development of novel environmentally friendly materials.
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