Shear-induced network-to-network transition in a block copolymer melt

被引：42

作者：

Cochran, EW ^{[1
]}

Bates, FS ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.087802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A tricontinuous (10,3)c network phase is documented in a poly(cyclohexylethylene-b-ethylethylene-b-ethylene) triblock copolymer melt based on small-angle x-ray scattering. Application of shear transforms the self-assembled soft material into a single crystal (10,3)d network while preserving the short-range threefold connector geometry. Long-range topological restructuring reduces the space group symmetry, from Fddd to Pnna, maintaining orthorhombic lattice symmetry. Both phases are stable to long time annealing, indicative of nearly degenerate free energies and prohibitive kinetic barriers.

引用

页码：087802 / 1

页数：4

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