共查询到17条相似文献,搜索用时 312 毫秒
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含液晶离聚物共混体系的研究进展 总被引:1,自引:0,他引:1
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. 相似文献
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离聚物在液晶聚合物与聚碳酸酯共混体系中的增容作用 总被引:3,自引:2,他引:1
离聚物在液晶聚合物与聚碳酸酯共混体系中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,离聚物,热致液晶聚合物原位复合材料(In situcomposite)是一种新兴的复合材料,是由热致液晶聚合... 相似文献
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Novel nematic fluorescent main-chain liquid crystalline ionomers containing Eu(III) ions (Eu-LCI) were synthesised by the use of bis(4-(chlorocarbonyl)phenyl) decanedioate (BD), 4,4-dihydroxybiphenyl (D), 2,5-dihydroxybenzoic acid (B) and anhydrous europium chloride. The chemical structures, liquid crystalline behaviours and fluorescence properties of Eu-LCI were characterised by various experimental techniques. The introduction of small amounts of europium ions endowed the LCI with excellent luminescence properties. POM results showed that europium ions did not change the liquid crystalline texture of the LCI. Fourier transform infrared imaging showed that europium ions were evenly distributed in the matrices of ionomers. A schematic diagram of nematic fluorescent LCI was established to demonstrate the interaction and distribution of the components. Eu-LCI showed reversible mesomorphic phase transitions, wide mesophase temperature ranges and high thermal stability. The thermogravimetric analysis (TGA) results showed that decomposition temperatures (5% weight loss) were greater than 308°C in all Eu-LCI. Eu-LCI can emit red light when excited. The luminescence intensity of Eu-LCI gradually increased with increase in Eu(III) ions from 0.3 to 1.5 mol%. The temperature dependence of luminescent intensity was studied in the liquid crystalline phase, where the fluorescence intensity of Eu-LCI decreased monotonically with increase in temperature. 相似文献
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通过熔融共混法将CaSO4纳米晶须和含磺酸离子的液晶离聚物(LCI)与聚对苯二甲酸丁二醇酯-聚乙烯(PBT-PE),制成PBT-PE-LCI-CaSO4纳米晶须杂化材料。通过DSC、红外图像系统分析和拉伸试验对共混体系的热性能、形态结构和力学性能进行了研究。结果表明:在共混体系中加入LCI提高了体系中PE的结晶温度和结晶度,并且LCI包裹着CaSO4纳米晶须,分散相PE均匀地分散在PBT基体中;当基体与CaSO4纳米晶须的质量比为100∶3时,杂化材料的力学性能最好。 相似文献
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合成了具有液晶性质的二元醇一对苯二甲酰二羟苯甲酸丁二醇酯(TOBB),这种二元醇单独或与端羟基聚了二烯(HTPB)混合后与二异氰酸酯反应生成几种聚氨酯,用IR,DSC,偏光显微镜和WAXD对它们进行了表征,证明这种二元醇和聚氨酯都具有液晶性质。 相似文献
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A. Saupe 《Angewandte Chemie (International ed. in English)》1968,7(2):97-112
Thermotropic mesomorphous phases such as occur in the melts of many organic substances are considered. Though mesomorphous melts were first observed by Reinitzer in 1888, fundamental structural problems regarding such melts have not, as yet, been completely solved. Part I of this article deals mainly with such structural problems and with the theories of crystalline organic liquids. Part II describes the use of nematic solvents for magnetic resonance studies on oriented molecules. Examples are given to illustrate the possibilities offered by this procedure, and some of the results obtained so far are reviewed. 相似文献
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含芳酯键的双马来酰亚胺Ia/二苯醚二胺共聚物的合成与液晶行为 总被引:3,自引:0,他引:3
本文以苯甲酸对苯二酚酯双马来酰亚胺(Ia)和二苯醚二胺为单体,合成了Ia/二苯醚二胺的共聚物,应用FTIR谱、热分析DTA和DSC、热台偏光显微镜对共聚物的结构和液晶行为进行了研究。该类共聚物具有较好的热致液晶行为,其液晶相结构可以通过共聚物的化学交联反应而固定在交联网络中,从而形成液晶网络材料。 相似文献
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采用低湿溶液缩聚的方法合成了对苯二甲酰氯,二甲基联苯胺和己二醇为单体的芳酯族液晶聚酯酰胺。用DSC,X光衍射分析和偏光显微镜等手段研究了该系列聚酯酰胺的热致液晶行为,确认了二甲基联苯胺单体用量在20%(mol)的情况下,所得聚酯酰胺仍为向列型液晶聚合物。由于聚酯酰胺分子间聚酰胺链段之间的氢键作用,随着二甲基联苯胺用量增加至60mol%时,所得的聚酯酰胺己无液晶转变温度,其液晶区间即从熔融温度直至分 相似文献