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  

MISCIBILITY ENHANCING IN POLYSTYRENE BLENDS WITH A LIQUID CRYSTALLINE POLYMER VIA INCORPORATING IONIC GROUPS Ⅰ. THERMAL PROPERTIES AND MORPHOLOGIES

作　　者：刘杰[1] 何嘉松[1] 

机构地区：[1]中国科学院化学研究所工程塑料国家重点实验室

出　　处：《高分子学报》1998年第2期196-202,共7页Acta Polymerica Sinica

基　　金：自然科学基金

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．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 Tg.The LCP's Tg'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.

关 键 词：增容剂 相容性 离聚物 热致液晶 LCP SPS 

分 类 号：O632.13[理学—高分子化学] TQ314.269[理学—化学]