IN SITU COMPOSITES CONTAINING LIQUID CRYSTALLINE POLYMERS AS SELF-REINFORCING COMPONENTS GUAN
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摘要: 刚性棒状的主链型热致液晶聚合物(TLCP)能自组织形成液晶畴,具有各向异性和优异的物理性质。将其加入到热塑性聚合物(TP)中,可明显改善体系的加工特性,并能"原位"生成高长径比、高模量和高强度的微纤,形成自增强的原位复合材料。本文作者简述了原位复合材料的加工流变学和微观结构形态;详细讨论了TLCP/TP原位复合材料的化学组成、物理性质(特别是相容性),和加工成型参数等因素对TLCP微纤的"原位"生成及其性能的影响;重点阐述了TLCP/TP共混体系的增容技术。文中作者首次提出了在加工过程中引入电场协助微纤原位生成,制备高性能原位复合材料的新概念。Abstract: Rigid rodlike molecular chains-thermotropic liquid crystalline polymers (TLCP), which would self-organize into domains, showed anisotropy and excellent physical properties. In situ composites containing fibrils with high aspect ratios, high strength and high modulus as self-reinforcing components were prepared via incorporation of TLCP into thermoplastic polymers (TP), which led to significantly improve the processability due to the reduction in viscosity. A brief review on the rheology and microstructure of in situ composites was given, and factors influencing TLCP fibrillation and mechanical properties, such as chemical and physical properties of components including compatibility between TLCP and TP, as well as processing parameters were presented in this paper with the related work available in the literature. The state-of-the-art compatibility technology for TLCP/TP blends was elucidated in detail. A new concept of preparation of high performance in situ composites involving fibrils formed with the aid of application of an electric field during the processing was put forward for the first time.
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