Thermoresponsive meso/nanostructured thermosetting materials based on PS-b-PEO block copolymer-dispersed liquid crystal: Curing behavior and morphological variation

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• 作者：Agnieszka Tercjak ; Elena Serrano ; Iñ ; aki Garcia ; Iñ ; aki Mondragon
• 关键词：Thermoresponsive materials ; Block copolymers ; Nanostructured thermoset ; Self-assembly ; Atomic force microscopy
• 刊名：Acta Materialia
• 出版年：2008
• 出版时间：October 2008
• 年：2008
• 卷：56
• 期：18
• 页码：5112-5122
• 全文大小：1005 K

文摘

The main aim of this contribution was the generation of novel intelligent materials, in this case meso/nanostructured thermoresponsive thermosetting materials, based on an epoxy resin modified with two amphiphilic poly(styrene-b-ethylene oxide) block copolymers (PSEO) and a low molecular weight liquid crystal, 4′-(hexyl)-4-biphenyl-carbonitrile (HBC). A strong influence of the addition of a small amount of PSEO block copolymer as the third component in PSEO–HBC–(DGEBA/MXDA) cured blends on both curing behavior and morphology has been observed. The introduction of 5 and 10 wt. % PSEO in the thermosetting ternary blends results in, depending of both PS-block and HBC content, thermoresponsive meso/nanostructured thermosetting materials with high contrast ratios between transparent and opaque states. It is envisaged that these novel meso/nanostructured blends may lead to new materials due to both the ability of self-assembly of block copolymers and the fact that block copolymer-dispersed low molecular weight liquid crystals behave as thermoresponsive materials in a thermosetting matrix.