溶胀末端模量法测PAC纤维大分子缠结密度

MEASUREMENT OF MACROMOLECULAR ENTANGLEMENT DENSITY IN PAC FIBERS VIA THERMAL SWELLING TERMINAL MODULUS

大分子缠结与纤维成形、拉伸及结构性能有甚为密切的关系。为了表征固态半结晶高聚物纤维中缠结的多少，本文提出了溶胀末端模量法。利用热机械分析法，检测到溶胀模量与温度的关系曲线，曲线末端的平台定义为溶胀末端模量。实际上是通过热和溶剂的作用分离了缠结和结晶两种效应，检测得仅有大分子链间勾结存在时的模量。采用橡胶弹性理论公式：Ｅ＿ｅ＝就可以算出高聚物纤维中勾结的数量。

Macromolecular Entanglement plays a special important role in formation,structure and properties ofchemical fibers. Previous work about macromolecular entanglement was restricted to noncrystalline polymer(e. g. polymer melt,polymer soltuion or amorphous polymer),especially,there are very few studies on the en- tanglement concerning with chemical fibers of semicrystalline polymers.This undoubtly restricted the compre-hension on fiber processing.In this work,thermal swelling terminal modulus was used to study macromolecu-lar entanglement network,and the experimental methods for measuring the amount of loopings and theamount of couplings were proposed.