Tunable ordered droplets induced by convection in phase-separating P2VP/PS blend film

被引：29

作者：

Cui, L ^{[1
]}

Wang, HF ^{[1
]}

Ding, Y ^{[1
]}

Han, YC ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

来源：

POLYMER | 2004年 / 45卷 / 24期

基金：

中国国家自然科学基金;

关键词：

ordered droplets; convection; phase-separating;

D O I：

10.1016/j.polymer.2004.09.065

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Ordered hexagonal droplets patterns in phase-separating polymeric blend films of polystyrene and poly(2-vinylpyridine) (PS/PVP) formed due to the convection effect by solvent evaporation. The influences of PS molecular weight, solvent evaporation rate, and the weight ratio of PS to PVP on the PVP-rich domains pattern formation and distributions were investigated by atomic force microscope (AFM). Only in an appropriate range of molecular weight of PS, can the ordered pattern form. Too low or too high molecular weight of PS led no ordered pattern due to the viscosity effects. The increase of solvent evaporation rate decreased the mean radius of the PVP-rich domains and the intervals between the centers of the domains due to the enhancement of the viscosity on the top layer of the fluid film. The increase of the weight ratio of PS to PVP decreased mean radius of the PVP-rich domains whereas the intervals between the centers of droplets remained constant. Therefore, the size and the distributions of ordered patterns can be tuned by the polymer molecular weight, the weight ratio of the two components and the solvent evaporation rate. It revealed that the hydrodynamic effects played a significant role on the pattern formation and distributions. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：8139 / 8146

页数：8

共 49 条

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