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

LIU Jie; HE Jiasong

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

Research Article | 更新时间：2021-03-19

- MISCIBILITY ENHANCING IN POLYSTYRENE BLENDS WITH A LIQUID CRYSTALLINE POLYMER VIA INCORPORATING IONIC GROUPS Ⅰ. THERMAL PROPERTIES AND MORPHOLOGIES
- Acta Polymerica Sinica Issue 2, Pages: 196-202(1998)
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- Published：20 April 1998，
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LIU Jie, HE Jiasong. MISCIBILITY ENHANCING IN POLYSTYRENE BLENDS WITH A LIQUID CRYSTALLINE POLYMER VIA INCORPORATING IONIC GROUPS Ⅰ. THERMAL PROPERTIES AND MORPHOLOGIES. [J]. Acta Polymerica Sinica (2):196-202(1998)
DOI：

LIU Jie, HE Jiasong. MISCIBILITY ENHANCING IN POLYSTYRENE BLENDS WITH A LIQUID CRYSTALLINE POLYMER VIA INCORPORATING IONIC GROUPS Ⅰ. THERMAL PROPERTIES AND MORPHOLOGIES. [J]. Acta Polymerica Sinica (2):196-202(1998) DOI：

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．

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

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 requirment 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 Disoersion confirmed the presence of sulfur-rich structures in those particles.

关键词

相容性离聚物热致液晶聚合物

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