Understanding the physics of Liquid Crystalline Elastomers and composites

了解液晶弹性体和复合材料的物理原理

• 批准号: 2596985
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2596985
• 关键词: Understanding; physics; Liquid; Crystalline; Elastomers

Liquid crystal elastomers (LCEs) are exciting examples of soft matter systems; they combine the properties of polymers and liquid crystals to produce materials with remarkable properties. Some of these are well-known, such as the potential for shape-changing in response to external stimuli such as temperature, light or electric fields. However, the Leeds team recently discovered LCEs as the first synthetic molecular auxetic (negative Poisson's ratio) materials. This is paradigm-shifting; although auxetic materials have been known for about 3 decades, the so-called re-entrant materials that have been studied so far rely on carefully engineered structures that are generally porous and that are formed from positive Poisson-ratio materials. The re-entrant materials are consequently difficult to manufacture, limited in size to structures of the order of tens of microns, and are not transparent. Our LCEs overcome all of these limitations, making them exciting materials that have possible applications in impact and delamination resistance, and as acoustic metamaterials.

液晶弹性体(LCE)是软物质体系的激动人心的例子；它们结合了聚合物和液晶的性质，产生了具有非凡性能的材料。其中一些是众所周知的，例如对温度、光或电场等外部刺激做出反应而改变形状的可能性。然而，利兹团队最近发现了LCEs作为第一种人工合成的分子伸展(负泊松比)材料。这是一种范式转换；尽管伸展材料已经被知道了大约30年，但到目前为止被研究的所谓的再入材料依赖于精心设计的结构，这些结构通常是多孔的，由正泊松比材料形成。因此，可再入材料难以制造，尺寸仅限于几十微米量级的结构，并且不透明。我们的LCE克服了所有这些限制，使它们成为令人兴奋的材料，可能在抗冲击和抗分层方面应用，并作为声学超材料。