Roll‐Casting of block copolymers and of block copolymer‐homopolymer blends
Roll‐Casting of block copolymers and of block copolymer‐homopolymer blends
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嵌段共聚物和嵌段共聚物-均聚物共混物的辊铸
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
E. Thomas
中科院分区：
文献类型：
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作者：
R. J. Albalak;E. Thomas
提出了一种由流动溶液浇铸高取向嵌段共聚物薄膜的改进技术。聚合物溶液在两个反向旋转的相邻圆柱体之间滚动，同时溶剂被允许蒸发。随着溶剂的蒸发，嵌段共聚物微相分离成全局取向结构。使用这种被称为“滚铸”的方法，我们在本文中提出了聚苯乙烯-聚丁二烯-聚苯乙烯（PS/PB/PS）三嵌段共聚物浇铸与不添加高分子量均聚物的形貌研究。纯共聚物薄膜由聚苯乙烯圆柱体组成，聚苯乙烯圆柱体在聚丁二烯基体中以接近单晶的结构组装在六角形晶格上。共聚物与高分子量聚苯乙烯和/或聚丁二烯的共混物，相分离成嵌入在取向嵌段共聚物基体中的均聚物的椭球状区域。薄膜退火导致均聚物区域转化为球，并伴有共聚物微畴的一些错位。讨论了透射电镜下膜的形貌。对实验系统中形成的流场进行了简要的讨论，并指出了它与我们以前工作的流场的相似性。©1994 John Wiley & Sons, Inc
An improved technique for casting highly oriented films of block copolymers from solutions subjected to flow is presented. Polymer solutions were rolled between two counter-rotating adjacent cylinders while at the same time the solvent was allowed to evaporate. As the solvent evaporated, the block copolymers microphase separated into globally oriented structures. Using this method known as ‘roll-casting’ we present in this paper a study of the morphology of polystyrene-polybutadiene-polystyrene (PS/PB/PS) triblock copolymer cast with and without additional high molecular weight homopolymers. The pure copolymer films consisted of polystyrene cylinders assembled on a hexagonal lattice in a polybutadiene matrix in a near single-crystal structure. Blends of copolymer with high molecular weight polystyrene and/or polybutadiene, phase separated into ellipsoidal regions of homopolymer embedded in an oriented block copolymer matrix. Annealing the films resulted in conversion of the homopolymer regions to spheres accompanied by some misalignment of the copolymer microdomains. The morphology of these films as revealed by TEM is discussed. A brief discussion of the flow field that develops in the experimental system is also presented and its similarity to the flow field of our previous work is shown. © 1994 John Wiley & Sons, Inc.