热致液晶聚合物／热塑性聚合物原位复合材料研究进展

综述了热致液晶聚合物／热塑性聚合物(TLCP／TP)原位复合材料的最新进展，系统阐述了TLCP／TP体系的微纤形成、流变行为、微观形态和力学性能，并对改善相容性和优化加工条件的研究工作作了具体介绍。     

光致变色液晶聚合物的光致再取向性能研究进展

光致变色分子经掺杂或键合作用嵌在液晶聚合物中可形成光致变色液晶聚合物，在线性偏振光或非偏振光的照射下，此物质中光致变色分子的构型变化会引起整个液晶分子的二维或三维光致再取向的形成，本文综述了光致变色液晶聚合物的光致再取向的近期研究进展。     

液晶聚合物的研究进展

综述了近年来液晶聚合物的研究状况和合成技术进展,重点讨论了主链型液晶聚合物、侧链型液晶聚合物及甲壳型液晶聚合物的分子结构设计、合成方法及主要性能。同时对液晶聚合物的发展趋势及应用前景进行了分析和展望。     

液晶聚合物及其涂料性能

本文研究了液晶聚合物及其母体丙烯酸共聚物的涂料性能,如柔韧性、硬度、附着力、干燥时间、粘度和耐化学药品性,评价了液晶丙烯酸共聚物用于涂料的可能性。所得数据表明,液晶聚合物附着力为100％,铅笔硬度为H－4H、干燥时间4－12h、粘度89－79cps、耐化学药品性良好。研究结果说明,内消旋基团和柔性间隔基因可提高母体丙烯酸共 聚物的涂料性能。     

液晶聚合物的开发与研究进展

液晶聚合物是近年开发的一类新型高性能材料。本文介绍了液晶聚合物的研究和发展状况，着重论述了新型液晶聚合物的开发、液晶聚合物的增强和填充、液晶聚合物合金以及分子复合材料等最新进展，并探讨了液晶聚合物的特性及其在宇航、电子、通讯等高技术领域中的应用前景。     

展望液晶聚合物在涂料中的应用

介绍了高性能液晶聚合物涂料并展望了类自然界色彩变换的液晶聚合物颜料在涂料中的应用。     

聚酯/液晶聚合物共混纤维的热处理

采用Ｘ射线衍射法、双折射法以及声速法研究了ＰＥＴ及其与液晶聚合物（ＬＣＰ）的共混初生纤维以及经过热处理后纤维的结晶结构和取向结构,并用应力－应变（Ｓ－Ｓ）法测定其断裂强度和初始模量。结果表明,ＬＣＰ的加入使初生纤维取向度和结晶度均下降,而喷头拉伸率增大则使共混初生纤维的结晶度和取向度均提高;由较大喷丝头拉伸率得到的共混纤维经热处理后取向度下降,而结晶度增大;当ＬＣＰ含量大于或等于１０％时,经热处理后共混纤维取向度下降;纤维２１０℃热处理后的晶粒尺寸明显大于１８０℃处理的,且前者的纤维各晶面的晶粒尺寸随着ＬＣＰ加入均有增大;纯ＰＥＴ纤维经热处理后力学性能提高,而ＰＥＴ／ＬＣＰ共混纤维热处理前后力学性能则呈较复杂的变化。     

液晶聚合物的研究进展

介绍液晶聚合物十分独特的分子结构，以及不同于其它工程塑料的特殊功能。简单介绍液晶聚合物的历史，综述液晶聚合物的国内外发展情况，研究现状以及液晶聚合物的制备，改性和应用等。讨论液晶聚合物在发展过程中存在的普遍性问题和解决的方法，并对液晶聚合物的市场前景，新的应用领域和发展方向作了具体的分析。     

热致液晶聚芳酯Vectran纤维的结构与性能

热致液晶聚芳酯Vectran纤维是一种新型的高性能纤维。介绍了Vectran纤维的发展状况、熔纺制备和热处理技术,分析了Vectran纤维的结构特征,对比研究了其力学性能、热性能、耐化学性能、抗蠕变以及耐摩擦性能等,并列举了其主要应用范围。     

热致性液晶全芳共聚酯的设计合成及其性能研究

通过熔融酯交换法,合成了一系列五元全芳共聚酯。利用热台偏光显微镜(PLM)、示差扫描量热法(DSC)等测试分析手段对所合成的产物进行了表征。研究发现,二羟基二苯酮在二酚单体中相对含量较高的情况时聚合产物具有较好的液晶性和成纤性能,表明该单体有利于合成高成纤性、高强度和低熔融加工温度的全芳液晶共聚酯。     

Ferrocene-containing Liquid Crystalline Polymers

This article is one of a number of reviews in a special issue to honor Prof. Dr. Ian Manners of the University of Bristol, UK, for his outstanding contributions in the field of organometallic polymers. The focus of this review is on the syntheses, properties, and characterization of ferrocene-containing liquid crystalline polymers in which ferrocene moieties are in or pendent to the backbone and also dendrimers and [60]fullerene-ferrocene liquid crystalline materials.     

Phase Diagram for Liquid Crystalline Polymer/ Polycarbonate Blends

A novel mechanism to form binary polymer blends is through phase separation by spinodal decomposition in the unstable region of the phase diagram. The present work investigates the effects of thermally‐induced phase separation by spinodal decomposition on the morphology development of liquid crystalline polymer/polycarbonate blends. Moreover, a thermodynamic binary phase diagram is obtained using a twin‐screw extruder at various processing melt temperatures. Differential scanning calorimetry and scanning electron microscopy were used to study the miscibility of the blends and the resulting morphology. A thermodynamic binary phase diagram exhibiting a lower critical solution temperature was obtained. The droplet size distribution of the blend was also obtained and discussed in light of the Cahn‐Hilliard theory.     

热致液晶高分子原位增强热塑性树脂复合材料研究进展

综述了热致液晶聚合物(TLCP)增强热塑性树脂(TP)原位复合材料的研究近况,主要讨论了TLCP／TP的增强机理,加工流变学特点,原位复合材料的界面相容性、结构特征与材料性能的关系,评述了多元共混和原位混杂增强复合材料。     

Binary Blends of Polytetrafluoroethylene and Liquid Crystalline Polymer

Blends of polytetrafluoroethylene (PTFE) and liquid crystalline polymer (LCP) were prepared by varying the amount of LCP when using a melt mixing technique. The rheological, morphological, thermal, and dynamic mechanical properties of the blends were investigated. The viscosity of the blends was decreased with the increasing LCP content in the blends up to 20% of LCP. With further loadings of LCP a slight improvement in viscosity was observed. This decrease in the viscosity was attributed to be the interlayer slip of the polymers due to formation of the elongated fibrils of LCP, whereas at higher amounts of LCP the fibril nature of LCP was not apparent, which is revealed by the scanning electron microscopic study. The differential scanning calorimetry (DSC) results showed a shift in the melting temperature (T_m) of PTFE with the addition of LCP. This shift in the T_m of PTFE is due to increasing crystallinity. This is further supported by the X-ray diffraction (XRD) and dynamic mechanical analysis (DMA) studies.     

自组装合成超分子液晶聚合物研究进展

从电荷转移作用、离子相互作用、氢键作用组装、金属配位组装、光化学组装5个方面综述了通过分子自组装合成超分子液晶聚合物的近年来的最新研究成果,并介绍了超分子液晶聚合物的应用及发展前景。     

具有形状记忆效应的液晶弹性体研究进展

综述了形状记忆聚合物（SMPs）的研究及应用现状,详细介绍了具有形状记忆性能的液晶弹性体的主要类型,包括热致形变液晶弹性体、光致形变液晶弹性体、电致形变和化学刺激导致形变液晶弹性体的形变机理及研究进展。最后,对液晶弹性体的发展前景进行了展望。     

Atom-Transfer Radical Polymerization to Synthesize Novel Liquid Crystalline Diblock Copolymers with Polystyrene and Mesogen-jacketed Liquid Crystal Polymer Segments

The synthesis of a series of new rod-coil diblock copolymers with different molecular weights and low polydispersity was achieved by atom transfer radical polymerization. The block architecture (coil-conformation of styrene segment and rigid-rod conformation of 2,5-bis[(4-methoxyphenyl)-oxycarbonyl]styrene segment) of the diblock copolymers was experimentally confirmed by proton nuclear magnetic resonance (¹H NMR) and differential scanning calorimetry (DSC). The liquid crystalline behavior of the copolymers was studied using DSC and a polarized optical microscope (POM). It was found that the liquid crystalline behavior was dependent on the molecular-weight of the rigid segment. Only those copolymers with M _n of the rigid block beyond 9,300 g/mol could form liquid crystalline phases above the glass transition temperature of the rigid block.     

Liquid Crystalline Polymers

Abstract

In this article emphasis will be placed on selectively from 45 papers presented at the spring meeting and 33 papers also presented at the fall meeting.