Property of diblock copolymer having extremely narrow molecular weight distribution

被引：29

作者：

Park, Soojin ^{[1
]}

Ryu, Du Yeol ^{[2
]}

Kim, Jin Kon ^{[2
]}

Ree, Moonhor ^{[1
]}

Chang, Taihyun ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Polymer Res Inst, Dept Chem, Pohang 790784, South Korea

[2] Pohang Univ Sci & Technol, Polymer Res Inst, Dept Chem Engn, Pohang 790784, South Korea

来源：

POLYMER | 2008年 / 49卷 / 08期

关键词：

polystyrene-block-polyisoprene; HPLC fractionation; microphase;

D O I：

10.1016/j.polymer.2008.03.009

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Molecular weight distribution effect on the morphological behavior of polystyrene-block-polyisoprene (PS-b-PI) diblock copolymers was investigated. PS-b-PI samples were prepared by anionic polymerization and further fractionated by HPLC to obtain the fractions of similar average molecular weight and composition but of narrower distributions in both molecular weight and composition. The strategy is to use reversed-phase LC to fractionate the PI block and normal phase LC to fractionate the PS block with a minimal effect on the other blocks. The interfacial thickness, grain size and the phase transition behavior of the unfractionated and fractionated PS-b-PI were compared by X-ray reflectivity, small angle X-ray scattering, transmission electron microscopy and theological measurements. The fractionated PS-b-PI with more homogeneous molecular weight and composition exhibits a narrower interface, larger grain size and a sharper morphological transition compared to the unfractionated PS-b-PI. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2170 / 2175

页数：6

共 42 条

[1] MULTIPLE ORDERED PHASES IN A BLOCK COPOLYMER MELT [J].