离聚物对含液晶聚合物聚砜体系的增容作用

离聚物对含液晶聚合物聚砜体系的增容作用刘杰，何嘉松（中国科学院化学研究所工程塑料国家重点实验室北京１０００８０）关键词增容作用，离子聚合物，热致液晶聚合物，高分子共混物，原位复合材料工程塑料与液晶聚合物（Ｌｒｙ）共混（形成所谓的原位复合材料）时在降低...     

嵌段液晶高聚物对聚醚砜 - 聚对苯二甲酸乙二醇酯/聚对羟基苯甲酸共混物的增容作用

嵌段液晶高聚物对聚醚砜 聚对苯二甲酸乙二醇酯／聚对羟基苯甲酸共混物的增容作用张海良张雪飞王霞瑜（湘潭大学化学化工学院湘潭４１１１０５）关键词增容作用，嵌段共聚物，原位复合材料基于热致性液晶高分子（ＴＬＣＰ）的原位复合材料以其高性能及易加工等特点而得...     

侧链液晶离聚物对PA1010/PP共混体系的增容作用

将聚酰胺（PA1010）、聚丙烯（PP）和热致型侧链液晶离聚物（SLCI）进行熔融共混，采用FTIR，SEM，DSC，WAXD研究测定了共混物中的相互作用，用形态结构，热行为和结晶行为，系统地研究了SLCI对PA101／PP共混物的增容作用。结果表明，SLCI有效地改善了PA1010／PP共混物的形态结构，增强了PA1010与PP链间的相互作用，使PA1010／PP熔点升高，结晶度提高。     

热塑性树脂的增强：从原位复合材料到原位混杂复合材料

综述了两类增强的热塑性树脂的基本方面。一类是由原位形成的热致液晶聚合物微纤增强的原位复合材料。从实验上研究了获得有效增强效果的两个关键因素；致热液晶聚合物的基体树脂中的成纤，以及在液晶聚合物与基体树脂不相容共混物中的增容作用。另一类是由作者发明的原位混杂复合材料，这一类材料是用直径在两个数量级上的纤维和原位形成的微纤混杂增强的。     

热致液晶聚合物的可纺性与其在基体树脂中的成纤

热致液晶聚合物的可纺性与其在基体树脂中的成纤何嘉松，张洪志（中国科学院化学研究所工程塑料国家重点实验室北京１０００８０）关键词热致液晶聚合物，熔融可纺性，高分子共混物，原位复合，亚微米增强用热致液晶聚合物（ＴＬＣＰ）对热塑性树脂产生亚微米级增强作用的...     

含液晶离聚物共混体系的研究进展

液晶离聚物(liquid crystalline ionomers,LCIs)是一种具有液晶性能的离聚物,也可以说是带有离子基团的液晶聚合物.将液晶离聚物与其它热塑性聚合物熔融共混时,其既能起到液晶聚合物的高模量、高强度作用,同时也具有离子的增容剂作用.本文论述了液晶离聚物在共混体系中的研究进展.按照液晶离聚物所含离子的不同,论述了含有-COOH,-SO3H和≡N+ 的液晶离聚物对共混体系的增容和增强作用.考察了液晶离聚物对共混体系热力学性能、形态结构和力学性能的影响.     

热致液晶聚合物微纤与碳纤维对聚醚砜的混杂增强

热致液晶聚合物微纤与碳纤维对聚醚砜的混杂增强张洪志王育立何嘉松（中国科学院化学研究所工程塑料国家重点实验室北京１０００８０）关键词热致液晶聚合物，碳纤维，混杂复合材料由两种或两种以上纤维增强同一种基体所得到的混杂纤维复合材料，不仅保留了单一纤维...     

液晶离聚物的合成

由于液晶离聚物需要在液晶聚合物中引入离子基团，因此造成了合成上的困难，有关液晶离聚物的合成还处于探索阶段。本文综述了液晶离聚物的合成方法，并描述了这些方法所获得的液晶离聚物的规律性的液晶行为。     

手性主链液晶离聚物的液晶性能

以6,6'-二羟基麦芽糖六乙酸酯(MA)、4,4'-对羟基联苯酚(MB)、2,5-二羟基苯甲酸(MC)、癸二酰氯(SD)为单体,采用溶液缩聚的方法合成了主链液晶离聚物.通过红外光谱、差示扫描量热及偏光显微等手段,研究了MC含量对液晶离聚物性能的影响.结果表明:液晶聚合物均为热致胆甾型,随MC含量的增加,其玻璃化转变温度、熔点和清亮点呈上升趋势,液晶相逐渐被破坏,羧酸离子的引入没有改变聚合物的液晶相类型.     

液晶离聚物

液晶离聚物是一种兼具液晶高分子和离聚物结构特征的新型聚合物。本文根据有关文献就其分类，合成，表征作了简要的综述，并对其研究发展前景进行了必要的讨论。     

引入离子基团改善聚苯乙烯和热致液晶聚合物的相容性 Ⅰ热性能和形态

ＤＳＣ和ＳＥＭ研究结果表明聚苯乙烯（ＰＳ）与一种热致液晶聚合物（ＬＣＰ）（ＰＨＢ／ＰＥＴ（６０／４０）共聚酯）完全不相容．共混体系具有与组分无关的Ｔｇ，并且表现出明显的两相结构．将ＰＳ进行化学改性（引入磺酸基团）制备成磺化聚苯乙烯（ＳＰＳ），随中和盐离子的变化有：酸式、Ｌｉ、Ｎａ、Ｚｎ和Ｍｎ盐五种形式．用ＤＳＣ和ＳＥＭ对ＬＣＰ与ＳＰＳ共混物的热性能和形态进行了分析和表征．共混体系有一个与组成相关，且明显低于纯ＳＰＳ的Ｔｇ．这表明了ＰＳ与ＬＣＰ的相容性因为磺酸基团的引入而得到了改善．同时用Ｆｏｘ方程计算了ＬＣＰ的Ｔｇ．当ＳＰＳ含量较低时（不大于５０％）在各个共混体系中，所估算的ＬＣＰ的Ｔｇ相互吻合．表明共混体系满足Ｆｏｘ方程的前提条件，即ＬＣＰ与ＳＰＳ形成相容体系．当ＳＰＳ含量较低时（２５％），ＬＣＰ／ＳＰＳ的共混物为较均一体系，断面光滑；而ＳＰＳ含量较高时，在脆断面可以观察到纳米级的颗粒．电子能谱分析证明了这些颗粒是ＳＰＳ负离子的聚集体．     

Shrinkage of blends of amorphous polymers with polymeric liquid crystals

In this paper the shrinkage behaviour of bisphenol-A-polycarbonate (PC), polystyrene (PS), poly((ethylene terephthalate)-co-(p-hydroxybenzoate)) liquid crystal polymer (LCP) is illustrated. Moreover, recoil's curves for PC/LCP and PS/LCP blends are shown. The different behaviour found for the two blends investigated is interpreted by taking into account that compatibility can occur between the two phases of the alloys. Moreover, the different physical state (liquid or solid) of the LCP phase at the recoil's temperature analyzed affects considerably its effectiveness in improving the shrinkage hosting matrix behaviour.     

Mutual influence of the morphology and capillary rheological properties in nylon/glass‐fiber/liquid‐crystalline‐polymer blends

Nylon‐6/glass‐fiber (GF)/liquid‐crystalline‐polymer (LCP) ternary blends with different viscosity ratios were prepared with three kinds of nylon‐6 with different viscosities as matrices. The rheological behaviors of these blends were characterized with capillary rheometry. The morphology was observed with scanning electron microscopy and polarizing optical microscopy. This study showed that although LCP did not fibrillate in binary nylon‐6/LCP blends, LCP fibrillated to a large aspect ratio in some ternary blends after GF was added. The addition of 5 wt % LCP significantly reduced the melt viscosity of nylon‐6/GF blends to such an extent that some nylon‐6/GF/LCP blends had quite low viscosities, not only lower than those of neat resins and nylon‐6/GF blends but also lower than those of corresponding nylon‐6/LCP blends. The mutual influence of the morphology and rheological properties was examined. The great reduction of the melt viscosity was considered the result of LCP fibrillation. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 1619–1627, 2004     

The crystallinity and miscibility of syndiotactic polystyrene blends after mixing with low molar mass liquid crystal or commercial lubricant

The quantities of the crystallinity of syndiotactic polystyrene (SPS) blended with another polymer in the group of poly(α-methyl styrene), poly(n-butyl methacrylate) or poly(cyclohexyl acrylate) with or without the additives were measured by X-ray diffraction and calculated by Ruland’s method. The SPS was synthesized by using metallocene catalyst and modified-methylaluminoxane as cocatalyst. The additive of low molar mass liquid crystal chemical (cyclohexyl-biphenyl-cyclohexane (CBC33)) or lubricant (glycerol monostearate (GMS)) was individually added to the blends of SPS in order to investigate the effects on the crystallinity of the blended SPS. From the experimental results, it was found that the percent crystallinities of the blends decreased with decreasing the percent of SPS in the blend because of the dilution of SPS. The depression of the percent crystallinity was in the order of PaMS > PCHA > PBMA according to the compatibility with SPS. The addition of GMS or CBC33 slightly decreased the percent crystallinity of the pure SPS. The addition of GMS impeded the depression of the SPS crystallinity in the blends, because their percent depression from pure SPS is similar (at around 25%) regardless to the components of the blends. The blends with added CBC33 have the similar depression of crystallinity as the pure blends because of the low concentration of CBC33 and the good compatibility of CBC33 with the SPS.     

酞侧基聚芳醚砜／对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物共混物的研究

The blends of phenolphthalein Polyethersulfone (PES - C ) and a thermotropic liquid crystalline polymer (LCP ) were prepared using melting mixing method.Rheological and mechanical properties of the blends were investigated. It was shown that addition of LCP in PES-C resulted in marked reduction of melt viscosity and improved processibility. The Chadly impact strength of the blend containing 2. 5% LCP increased about 2. 5 times comparing with pure PES-C. The tensile strength, Young's modulus, fie-cural strength and flexural modulus of the PES-C/LCP blends were also improved on some extent. The morphology of these blends were also observed by SEM,and the relationship between the me-chanical properties and the morphology of blends were discussed.     

酞侧基聚芳醚砜／对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物共混物的研究

酞侧基聚芳醚砜／对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物共混物的研究李刚，殷敬华，李滨耀（中国科学院长春应用化学研究所，长春，１３００２２）关键词酞侧基聚芳醚砜，热致性液晶高聚物，原位复合材料，对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物将热塑性树脂与热...     

PET/LCP反应性共混物的非等温结晶动力学

采用DSC方法研究了聚对苯二甲酸乙二酯 (PET)和热致性液晶共聚酯 6 0PHB PET (LCP)体系在少量扩链剂双 (2 唑啉 ) (BOZ)存在下形成的反应性共混物的非等温结晶动力学 .结果表明反应性共混物的Avrami指数均在 3 0～ 4 5之间 ,BOZ的加入使反应共混物中PET组分的结晶速率降低 ;表明BOZ对酯交换的促进作用 ,使所生成的共聚酯中PET嵌段的数均序列长度变短 ,而使结晶在某种程度上较为困难 ,但对体系的成核和结晶生长机理无明显影响 .结果还表明 ,随冷却速率的增大结晶峰向低温方向移动     

Miscibility of Semi-flexible Thermotropic Liquid Crystalline Copolyesteramide with Polyamide 66

IntroductionIn sl'tu polymer composites containing liquid crystalline polymers(LCPs) have attractedconsiderable attention in the past'decades['--'j. But the development of in sl'tu composites is restricted by two factors. First, the melting temperatures of thermotropic liquid crystallinepolymers (TLCPs) are generally higher than those of the commodity engineering resins. Athigh processing temperatures, these resins tend to become unstable, thereby, causing seriousproblems during fiber spinn…     

用超临界CO_2制备微孔聚苯乙烯/热致液晶聚合物原位复合材料

微孔聚合物是80年代初发明的一种新型多孔材料,其特征为:泡孔直径1～10 μm,泡孔密度109～1012cells/cm3,相对密度0.05～0.95.具有缺口冲击强度高、韧性高、比强度高、疲劳寿命长、热稳定性高、介电常数低和导热系数低等优异性能.同时,制备微孔聚合物使用无公害、易回收的CO2和N2替代对臭氧层有害的氯氟烃(氟利昂)和易燃的碳氢化合物等作为发泡剂,是一种新型绿色材料[1].在微孔聚合物中使用超临界流体是90年代初提出的新方法[2～4],可缩短加工时间,同时制得泡孔直径更小、泡孔密度更大的微孔材料.目前研究中,对聚合物多相体系的研究报道很少,只有HIPS[5]、PE/iPP[6]和PVC/木纤维复合材料[7]等少数体系的报道,而聚合物多相体系的研究是材料科学的主要研究领域.可以预见,加入少量第二组分的共混物为基体的微孔材料可以达到更为优异的性能.本工作选择聚苯乙烯与热致液晶聚合物的原位复合材料为研究对象,采用超临界CO2快速降压法[3]制备微孔材料.在前期工作中,报道了该材料是一种综合了液晶聚合物的高强度和聚苯乙烯微孔材料轻质、高抗冲、保温隔音性能的具有仿生结构的新型复合材料[8].本文在此基础上,进一步研究热致液晶聚合物的加入对微孔结构的影响以及界面相容剂在微孔成型中的作用.