二元共混聚合物的热诱导周期性相分离

摘要

Simulations were carried out for studying the periodic phase separation of a symmetric binary polymer blend on the basis of Cahn-Hilliard-Cook theory. The time dependent interaction parameter x(τ) was assumed to undergo a step-wise oscillation. The hierarchic structures composed of both large and small domains were obtained. The mechanism of the periodic formation of hierarchic structures was also demonstrated.%采用Cahn-Hilliard-Cook理论模拟了二元共混聚合物体系的热诱导周期性相分离.模拟结果显示,共混体系呈现二尺度相分离结构.其中,小尺度相区周期性的产生并消失,而大尺度相区逐渐增长.通过结构因子的演化,讨论了二尺度相分离结构的形成机理,并且考察了相互作用参数的震荡幅度与体系特征尺度的关系.