SAXS study of the lamellar–cylindrical transition in the PI-b-P2VP(OG) supramolecules' system
- 作者：Sasa Bondzic ; Evgeny Polushkin ; Janne Ruokolainen ; Gerrit ten Brinke
- 关键词：Self-assembly ; Supramolecules ; Order– ; order transitions
- 刊名：Polymer
- 出版年：2008
- 期刊代码：83_00323861
- 类别：ms
- 出版时间：27 May 2008
- 卷：49
- 期：11
- 页码：2669-2677
- 文件大小：2277 K
摘要
A detailed SAXS study of self-assembled block copolymer-based supramolecules composed of a polyisoprene-block-poly(2-vinylpyridine) diblock copolymer and octyl gallate that is hydrogen bonded to the vinylpyridine block in a stoichiometric ratio is presented. The changes in the system morphology with temperature are investigated both at rest and under oscillatory shear. In between the lamellar-to-cylindrical transition a new intermediate structure, identified as a deformed hexagonal structure (DHS), was observed. Being at rest the DHS is argued to consist of ellipsoidal cylinders that adopt a more regular circular shape when the sample is subjected to shear. These results are discussed in terms of hydrogen bond breaking under shear.