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重新审视聚环氧乙烷溶液中聚合物-颗粒的相互作用

Revisiting Polymer-Particle Interaction in PEO Solutions.

作者信息

Espasa-Valdepeñas A, Vega J F, Cruz V, Ramos J, Müller A J, Martinez-Salazar J

机构信息

Biophym, Departamento de Física Macromolecular, Instituto de Estructura de la Materia (IEM-CSIC) c/Serrano 113 bis, 28006 Madrid, Spain.

POLYMAT and Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain.

出版信息

Langmuir. 2021 Apr 6;37(13):3808-3816. doi: 10.1021/acs.langmuir.0c02715. Epub 2021 Mar 25.

DOI:10.1021/acs.langmuir.0c02715
PMID:33764765
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9132384/
Abstract

We have measured the electrophoretic mobility and diffusion coefficient of carboxylate-modified and sulfate-modified polystyrene latex particles in poly(ethylene oxide) aqueous solutions. -modified polystyrene particles have shown a bound polymeric layer as the surface net charge vanishes even at very low poly(ethylene oxide) concentration. The polymeric layer causes a lower electrophoretic mobility and slower Brownian diffusion than that corresponding to the bare particles. We show that the diffusion is the result of a significantly increased effective particle size 2 = 30 nm. This bound layer is not present in sulfate-modified polystyrene latex particles. The interaction between the carboxylate-modified particle surface and the macromolecules has been confirmed by means of atomistic computer simulations. The grafted acrylate copolymers, which come from the preparation procedure of the latex particles, confer more hydrophobic surface ready to interact with the polymer. The simulations suggest that the interaction is modulated not only by the nature of the acrylic acid monomer but also by the length of the grafted copolymer. Our results have important implications for particle selection in microrheology experiments.

摘要

我们测量了羧酸盐改性和硫酸盐改性的聚苯乙烯乳胶颗粒在聚环氧乙烷水溶液中的电泳迁移率和扩散系数。即使在非常低的聚环氧乙烷浓度下，随着表面净电荷消失，改性聚苯乙烯颗粒已显示出一个结合的聚合物层。该聚合物层导致电泳迁移率降低，布朗扩散比裸颗粒对应的扩散更慢。我们表明，扩散是有效粒径显著增加（(D = 30)纳米）的结果。硫酸盐改性的聚苯乙烯乳胶颗粒中不存在这种结合层。通过原子计算机模拟证实了羧酸盐改性颗粒表面与大分子之间的相互作用。来自乳胶颗粒制备过程的接枝丙烯酸共聚物赋予更疏水的表面，易于与聚合物相互作用。模拟表明，相互作用不仅受丙烯酸单体性质的调节，还受接枝共聚物长度的调节。我们的结果对微流变学实验中的颗粒选择具有重要意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/20ca2b68835b/la0c02715_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/b4c3a3a548c7/la0c02715_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/0aa2e45b5c17/la0c02715_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/868774eae0dd/la0c02715_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/ec9278467e02/la0c02715_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/31f555931f05/la0c02715_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/81af5d6fa3fa/la0c02715_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/20ca2b68835b/la0c02715_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/b4c3a3a548c7/la0c02715_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/0aa2e45b5c17/la0c02715_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/868774eae0dd/la0c02715_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/ec9278467e02/la0c02715_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/31f555931f05/la0c02715_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/81af5d6fa3fa/la0c02715_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e05/9132384/20ca2b68835b/la0c02715_0007.jpg

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