PS-b-PEO-b-PS三嵌段共聚物的分子聚集行为:起始溶剂中水含量、外加均聚物及温度的影响

Aggregation Behavior of PS-6-PEO-6-PS Triblock Copolymers in Aqueous Media: Effect of Water Contents in Initial Solvents, Addition of Homopolymer, and Temperature

研究了两类Ps-b-PEO-b-PS三嵌段共聚物水介质中分子聚集行为的三种因素依赖性,包括起始溶剂中水的含量、外加均聚物及温度的影响。聚集体的制备采用先把共聚物溶解于共溶剂中,然后滴加选择性溶剂水的方法。采用TEM技术表征了自组装分子聚集体的形态。实验结果发现起始溶剂中过量的水、添加过量的均聚物以及升高温度,都不利于体系的有序聚集。

The dependence of aggregation behavior of PS-b- PEO-b-PS triblock copolymers in aqueous media on three kinds of factors was investigated. The affecting factors include water contents in initial solvents, addition of homopolymer, and temperature. The self-assembled aggregates were prepared by firstly dissolving the copolymers into the initial common solvents, then adding water into copolymer solutions in order to induce the aggregation. The morphology of aggregates was characterized with transmission electron microscope. The experimental results suggested that it was unfavorable for ordered aggregation of block copolymers to add too much water into initial solvents and homopolymer into copolymers, and to elevate temperature.