聚苯乙烯-聚甲基丙烯酸甲酯两嵌段共聚物薄膜在超临界二氧化碳和丙酮溶剂耦合作用下的形貌演化

Coupling Effect of scCO_2 and Acetone on the Morphologies Evolution of Polystyrene-b-Poly(methyl methacrylate) Diblock Copolymer Thin Films

以聚苯乙烯-聚甲基丙烯酸甲酯(PS-b-PMMA)两嵌段共聚物薄膜为考察对象,首先对比研究了PS-b-PMMA薄膜分别在丙酮溶剂和超临界二氧化碳(scCO_2)环境中退火的形貌演变,进而提出利用scCO_2和丙酮溶剂的耦合作用调控嵌段共聚物薄膜的相转变。实验结果表明,利用scCO_2和丙酮溶剂的耦合作用,能够显著缩短嵌段共聚物薄膜的有序-无序相转变时间,得到高度有序的分相形貌。

In this work, the morphologies evolution of polystyrene-b-poly （methyl methacrylate） （PS-B-PMMA） diblock copolymer thin films under acetone or supercritical carbon dioxide （scCO2） was investigated, respectively. After that, the coupling effect of scCO2 and acetone on the disorder-order transition of PS-b-PMMA was studied systematically. The results show that the combined influence of scCO2 and acetone leads to a faster order-disorder transition kinetics and thus well-ordered phase structures.