STUDIES OF THE SUPERMOLECULAR STRUCTURE OF ACRYLIC FIBRES BY MEANS OF THERMO-MECHANICAL ANALYSIS Ⅱ. Determination of the Orientation Factor by Thermo-swelling Contraction

QIAN Bao-jun

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STUDIES OF THE SUPERMOLECULAR STRUCTURE OF ACRYLIC FIBRES BY MEANS OF THERMO-MECHANICAL ANALYSIS Ⅱ. Determination of the Orientation Factor by Thermo-swelling Contraction

Research Article | 更新时间：2021-03-19

- STUDIES OF THE SUPERMOLECULAR STRUCTURE OF ACRYLIC FIBRES BY MEANS OF THERMO-MECHANICAL ANALYSIS Ⅱ. Determination of the Orientation Factor by Thermo-swelling Contraction
- Acta Polymerica Sinica Issue 4, Pages: 201-209(1979)
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- Published：20 August 1979，
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QIAN Bao-jun. STUDIES OF THE SUPERMOLECULAR STRUCTURE OF ACRYLIC FIBRES BY MEANS OF THERMO-MECHANICAL ANALYSIS Ⅱ. Determination of the Orientation Factor by Thermo-swelling Contraction. [J]. Acta Polymerica Sinica (4):201-209(1979)
DOI：

QIAN Bao-jun. STUDIES OF THE SUPERMOLECULAR STRUCTURE OF ACRYLIC FIBRES BY MEANS OF THERMO-MECHANICAL ANALYSIS Ⅱ. Determination of the Orientation Factor by Thermo-swelling Contraction. [J]. Acta Polymerica Sinica (4):201-209(1979) DOI：

摘要

本文测定了一系列不同热拉伸比的风干PAC纤维的热溶胀收缩率

发现有一个剧烈的熵收缩阶段

继之以一个缓慢收缩阶段

用一个大分子收缩模型

将熵收缩S′与实测的二色性取向因素相联系

发现-cos2a(取向角余弦的均方)与S′成线性相关。假定缓慢收缩是由于解取向

用同一模型可以推导出一个方程式

用来计算cos2αm

-cos2a值和cos2α_m值的接近

说明缓慢收缩是由于解取向的假设是有根据的。

Abstract

The thermo-swelling contraction of a series of air-dried PAC fibres is firstly determined. A stage of very rapid entropic contraction S' is observed

followed by a second stage of relatively slow rate of contraction. With a model of contraction of a macromolecule

a good correlation between S' and cos2α is noticed

where a is the angle of orientation.With the supposition that the slow contraction is due to a disorientation effect of the swollen fibre

an equation is derived

with which cos2αm value can be calculated.The agreement between -cos2a nad cos2am serves as a support to the theory of disorien-tation.

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