Guangdong Provincial Key Laboratory for Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
J Colloid Interface Sci. 2021 Apr;587:173-182. doi: 10.1016/j.jcis.2020.11.122. Epub 2020 Dec 3.
Dissipative particle dynamics (DPD) simulations was adopted to investigate the modification of polyvinylidene fluoride (PVDF) membrane by adding zwitterionic polymer brush poly(sulfobetaine methacrylate)- tetraethyl orthosilicate (PSBMA-TEOS) grafted silicon nanoparticles (SNPs) to the casting solution. The effects of polymer concentration and grafting architecture (PSBMA length and SNPs grafting ratio) on membrane morphology are discussed. When the polymer concentration reaches 40%, part of the SNPs is embedded in the membrane; the optimal polymer concentration is around 25-30%. In the SNPs system with the grafting ratio of 1, some SNPs are eluted into solution during phase separation. Compared with different grafting architectures, M, M and M system (M, where x represents the length of the zwitterionic polymer brush and y represents the grafting ratio of the silica nanoparticles) exhibited stable membrane morphologies. This work can provide guidance for the design and modification of organic-inorganic composite membrane and help understand the distribution of modified materials on the membrane surface.
采用耗散粒子动力学（DPD）模拟研究了聚偏二氟乙烯（PVDF）膜的改性，即在铸膜液中添加两性离子聚合物刷聚（磺酸甜菜碱甲基丙烯酸酯）-四乙氧基硅烷（PSBMA-TEOS）接枝硅纳米粒子（SNPs）。讨论了聚合物浓度和接枝结构（PSBMA 长度和 SNPs 接枝率）对膜形态的影响。当聚合物浓度达到 40%时，部分 SNPs 嵌入膜中；最佳聚合物浓度约为 25-30%。在接枝率为 1 的 SNPs 体系中，一些 SNPs 在相分离过程中被洗脱到溶液中。与不同接枝结构相比，M、M 和 M 体系（M，其中 x 代表两性离子聚合物刷的长度，y 代表硅纳米粒子的接枝率）表现出稳定的膜形态。这项工作可以为有机-无机复合膜的设计和改性提供指导，并有助于理解改性材料在膜表面的分布。
