The Force Field Dependence of the Deformation and Orientation of Molecular Chains during the Spinning of PAN/DMSO Solution

Long LI; De-yu KONG; Wang CHEN; Yi-jun GAO; Liang-hua XU; Wei-yu CAO

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The Force Field Dependence of the Deformation and Orientation of Molecular Chains during the Spinning of PAN/DMSO Solution

更新时间：2022-09-18

- The Force Field Dependence of the Deformation and Orientation of Molecular Chains during the Spinning of PAN/DMSO Solution
- Polymer Bulletin Vol. 27, Issue 10, Pages: 98-102(2014)
- 作者机构：
  
  1.北京化工大学，有机无机复合材料国家重点实验室，北京　100029
  2.北京化工大学，碳纤维及功能高分子教育部重点实验室，北京　100029
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014-10，
  
  Received：02 May 2014，
  
  Revised：26 June 2014，
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Long LI, De-yu KONG, Wang CHEN, Yi-jun GAO, Liang-hua XU, Wei-yu CAO. The Force Field Dependence of the Deformation and Orientation of Molecular Chains during the Spinning of PAN/DMSO Solution. [J]. Polymer Bulletin 27(10):98-102(2014)
DOI：

Long LI, De-yu KONG, Wang CHEN, Yi-jun GAO, Liang-hua XU, Wei-yu CAO. The Force Field Dependence of the Deformation and Orientation of Molecular Chains during the Spinning of PAN/DMSO Solution. [J]. Polymer Bulletin 27(10):98-102(2014) DOI：

摘要

通过剪切及拉伸流变性能分析研究了聚丙烯腈(PAN)干湿法及湿法过程中初生纤维分子链的形变过程，同时采用声速法研究了初生纤维取向结构对外力场环境的依赖性。结果表明，剪切造成PAN分子链的解缠结并形成预有序结构，而牵伸的主要作用是使分子链网络发生形变与物理交联点的消除。在相同剪切条件下，干湿法过程由于巴勒斯效应的存在，湿法制备的初生纤维分子链取向因子优于干湿法初生纤维。同时，在相同牵伸条件下，由于需要额外克服粘性解缠过程产生的内应力，湿法制备的初生纤维分子链取向因子优于干湿法初生纤维。剪切速率的增加更有利于湿法初生纤维的分子链取向的形成，而牵伸力的增加更有利于干湿法初生纤维的分子链取向的形成。

Abstract

Acoustic velocity method was applied to study the molecular chain orientation factor of PAN nascent fiber obtained by dry-wet spinning and wet-spinning processes

respectively. The results indicated that with the increasing of shear rate and drawing ratio

the molecular orientation factor of the nascent fiber gradually improved. In the case of dry-wet spinning

the elastic recovery process of PAN molecular occurred during the air gap

the pre-orientation structure obtained by shearing was disordered. In addition

the drawing stress was needed to overcome the internal stress generated by the viscous motion

the molecular orientation was lower than that of the nascent fiber obtained by wet-spinning. When the shearing force was increased

the orientation factor of the nascent fiber produced by wet spinning changed more obviously. On the other hand

the stretching force is benefit to the formation of orientation structure during dry-wet spinning compare to wet-spinning process.

关键词

PAN初生纤维干湿法湿法取向结构

Keywords

PAN nascent fiberDry-wet spinningWet-spinningOrientation structure

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The Effect of the Force Field on the Crystalline and Orientation Structure of PAN Nascent Fiber during Dry Jet Wet-Spinning and Wet-Spinning Processes

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Beijing University of Chemical Technology,State Key Laboratory of Organic-Inorganic Composites, The Key Laboratory of Education Ministry on Carbon Fiber and Functional Polymer

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