Fabrication of monodisperse asymmetric polystyrene particles by crosslinking regulation in seeded emulsion polymerization
Fabrication of monodisperse asymmetric polystyrene particles by crosslinking regulation in seeded emulsion polymerization
复制标题
种子乳液聚合中交联调节制备单分散不对称聚苯乙烯颗粒
DOI：
10.1016/j.polymer.2020.122799
复制
发表时间：
2020
期刊：
影响因子：
4.6
通讯作者：
Dong Qiu
中科院分区：
文献类型：
--
作者：
Xiaohui Meng;Dong Qiu
交联聚合是合成非对称聚合物粒子的一种新方法，但在结构的精确调控方面存在很大的挑战。在目前的工作中，有意引入预形成的交联壳来限制种子颗粒中的进一步聚合，为合成具有表面形态和整体形状变化的不对称聚合物颗粒提供了一种可靠的方法。通过系统实验研究了交联剂浓度、单体/种子比和膨胀时间对聚苯乙烯颗粒结构的调节作用。从交联驱动变形的角度，提出了一种可能的机制来解释种子乳液聚合过程中聚合物颗粒的结构演变，在此基础上，从不同直径的种子颗粒中制备出具有相同结构的不对称聚合物颗粒。
Crosslinking-involved polymerization is a facial and attractive approach to synthesize asymmetric polymer particles despite the great challenge in precisely structure regulation. In the present work, a pre-formed crosslinked shell was intentionally introduced to restrict further polymerization in the seed particles, providing a robust approach for synthesis of asymmetric polymer particles with variations in both surface morphology and overall shape. Systematic experiments were implemented to investigate the role of crosslinker concentration, monomer/seed ration and swelling time in the structure regulation to polystyrene particles. A possible mechanism, in the perspective of crosslinking driven deformation, was proposed to account for the structural evolution of obtained polymer particles during seeded emulsion polymerization, based on which, asymmetric polymer particles with uniform structures of interest from seed particles with different diameters were fabricated.