Influence of shell strength on shape transformation of micron-sized, monodisperse, hollow polymer particles
Influence of shell strength on shape transformation of micron-sized, monodisperse, hollow polymer particles
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DOI：
10.1007/s00396-002-0716-x
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发表时间：
2003-03-01
影响因子：
2.4
通讯作者：
Morikawa, K
中科院分区：
文献类型：
--
作者：
Okubo, M;Minami, H;Morikawa, K
采用作者于1991年提出的动态溶胀法制备了（二乙烯基苯/乙烯基联苯/二甲苯）溶胀的聚苯乙烯颗粒分散体，通过种子聚合反应制备了具有“橄榄球”和“红细胞”形状的单分散非球形聚合物颗粒。它们的非球形形状是基于所得中空颗粒的壳的屈曲。本文通过控制壳层强度，详细研究了中空复合聚合物粒子在球形与非球形之间的可逆形变。当壳的拉伸模量低于由Uemura提出的球壳的压力-屈曲关系计算的临界值时，壳的一部分被由二甲苯从中空体中蒸发而引起的外压屈曲。良溶剂对壳层的增塑作用是影响壳层形态转变的关键因素之一。
Micron-sized, monodisperse, non-spherical polymer particles with "rugby ball" and "red blood corpuscle" -like shapes were produced by seeded polymerization of the dispersion of (divinylbenzene/ vinylbiphenyl/xylene)-swollen polystyrene particles prepared by utilizing the dynamic swelling method which the authors proposed in 1991. Their non-spherical shapes were based on buckling of the shell of the resultant hollow particles. In this article, the reversible shape transformation of the hollow composite polymer particle between spherical and such non-spherical shapes was studied in detail by controlling the shell strength. A part of the shell was buckled by external pressure which was caused by evaporation of xylene from the hollow when the shell had the tensile modulus below the critical value calculated from the pressure-buckling relationship of a spherical shell proposed by Uemura. The plasticization of the shell by a good solvent was one of key factors for the shape transformation.