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 |
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引用本文: | 刘杰,何嘉松. 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[J]. 高分子学报, 1998, 0(2) |
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作者姓名: | 刘杰 何嘉松 |
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作者单位: | 中国科学院化学研究所工程塑料国家重点实验室 |
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摘 要: | 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.
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关 键 词: | 相容性,离聚物,热致液晶聚合物 |
MISCIBILITY ENHANCING IN POLYSTYRENE BLENDS WITH A LIQUID CRYSTALLINE POLYMER VIA INCORPORATING IONIC GROUPS Ⅰ. THERMAL PROPERTIES AND MORPHOLOGIES |
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Abstract: | Polystyrene (PS) was completely immiscible with a liquid crystalline polymer (LCP),PHB/PET copolyester,and their blends had a distinctive two phase structure.Then PS was chemically modified by introducing sulfonic acid group onto its molecular chains.Thereafter the properties of LCP blends with modified PS,sulfonated polystyrene(SPS),taking five forms:acid form,Li,Na,Mn and Zn salt forms,were carefully characterized with the DSC and SEM.DSC results demonstrate that SPS is miscible with LCP evidenced by exhibiting only one composition dependent Tg.The LCP's Tg's calculated from the Fox Equation were about the same in blends at the studied composition.This means that the requirement of Fox Equation has been met,i.e. LCP is completely miscible with SPS.The miscibility enhancing is confirmed by SEM observations too.LCP/PS blends showed a distinct two phase structure.LCP blends and SPS with low SPS contents(25%) exhibited only a single very smooth texture,whereas those with high SPS contents(75%) had nanometer scaled droplets dispersed through the whole surface.Energy Dispersion confirmed the presence of sulfur rich structures in those particles. |
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Keywords: | Miscibility Ionomer Thermotropic liquid crystalline polymer |
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