Stretching PEO–PPO Type of Star Block Copolymer Gels: Rheology and Small-Angle Scattering,ACS Macro Letters

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Stretching PEO–PPO Type of Star Block Copolymer Gels: Rheology and Small-Angle Scattering
ACS Macro Letters ( IF 5.1 ) Pub Date : 2018-11-21 00:00:00 , DOI: 10.1021/acsmacrolett.8b00792
Kell Mortensen ₁ , Masahiko Annaka ₂

Affiliation

Cross-linked Tetronic star block copolymer gels, based on poly(ethylene oxide) and poly(propylene oxide), behave quite regular with respect to mechanical properties, but exhibits unusual absence of structural response to strain. The elastic response is linear up to more than 100% strain, with a steady-state modulus of the order of 0.01 MPa after an initial stress relaxation. Neutron and X-ray scattering experiments show a consistent but unexpected response to uniaxial strain, with no changes in characteristic molecular dimensions. Upon strain beyond about 100%, that is, when the stress–strain curve is no longer linear, structural texture appears and becomes even more pronounced upon further strain, thus, indicating alignment of the self-assembled hexagonally ordered cylindrical micelles with the cylinder-axis perpendicular to the strain. It is proposed that the main structural response to large-amplitude strain is related to a layer-dominated structure of cross-linked star molecules.

中文翻译：

拉伸 PEO-PPO 型星形嵌段共聚物凝胶：流变学和小角散射

基于聚（环氧乙烷）和聚（环氧丙烷）的交联 Tetronic 星形嵌段共聚物凝胶在机械性能方面表现非常规则，但对应变的结构响应异常缺乏。弹性响应在超过 100% 应变时呈线性，初始应力松弛后稳态模量约为 0.01 MPa。中子和 X 射线散射实验显示出对单轴应变的一致但出乎意料的响应，特征分子尺寸没有变化。当应变超过约 100% 时，即当应力 - 应变曲线不再是线性时，结构纹理出现并且在进一步应变时变得更加明显，因此，表明自组装六边形有序圆柱胶束与圆柱 -轴垂直于应变。

更新日期：2018-11-21

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