Thermoreversible, epitaxial fcc ⇆ bcc transitions in block copolymer solutions -: art. no. 215505

被引：57

作者：

Bang, J

Lodge, TP

Wang, XH

Brinker, KL

Burghardt, WR

机构：

[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

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

[3] Northwestern Univ, Dept Chem Engn, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.89.215505

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Uncharged block copolymer micelles display thermoreversible transitions between close-packed and bcc lattices for a range of concentration, solvent selectivity, and copolymer composition. Using small-angle x-ray scattering on shear-oriented solutions, highly aligned fcc crystals are seen to transform epitaxially to bcc crystals, with fcc/bcc orientational relationships that are well established in martensitic transformations in metals. The transition is driven by decreasing solvent selectivity with increasing temperature, inducing solvent penetration of the micellar core.

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