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

Long LI; Meng-fan WANG; Na JIAO; Liang-hua XU; Wei-yu CAO

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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

更新时间：2022-09-18

- 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
- Polymer Bulletin Vol. 27, Issue 1, Pages: 43-58(2014)
- 作者机构：
  
  北京化工大学，有机无机复合材料国家重点实验室，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：2014-01，
  
  Received：12 July 2013，
  
  Revised：30 August 2013，
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Long LI, Meng-fan WANG, Na JIAO, Liang-hua XU, Wei-yu CAO. 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. [J]. Polymer Bulletin 27(1):43-58(2014)
DOI：

Long LI, Meng-fan WANG, Na JIAO, Liang-hua XU, Wei-yu CAO. 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. [J]. Polymer Bulletin 27(1):43-58(2014) DOI：

摘要

利用广角X射线衍射(WAXD)研究了聚丙烯腈(PAN)干湿法及湿法初生纤维晶区及其取向结构的形成过程。结果表明，干湿法和湿法初生纤维的结晶度和H ermann取向因子随剪切速率和牵伸力增加而增大，相同条件下湿法制备的初生纤维晶区取向较优。干湿法过程中，由于牵伸张力在空气层段的集中，分子链凝固相分离过程发生在相对较弱的力场环境下，降低了结晶过程晶区的取向。湿法过程中，受到剪切作用的分子链直接进入凝固浴后即进入结晶过程，晶区取向度在张力诱导下相对较高。根据上述研究结果，提出了凝固过程中结晶及取向结构形成的分子链演变模型。

Abstract

Wide angle X-ray diffraction (WAXD) was applied to study the Hermann orientation factor and crystallinity of PAN nascent fiber obtained by dry jet wet-spinning and wet-spinning methods

respectively. Based on the azimuthal scan results

it was indicated that with the increasing of shear rate and drawing ratio

the Hermann orientation factor of the nascent fiber gradually improved. At the same shear rate and drawing ratio

compared with the nascent fiber made by dry jet wet-spinning

the orientation factor of the nascent fiber produced by wet spinning is higher. During the dry jet wet- spinning process

the crystallization was occurred under weak stretching since the drawing force was focus on the soft part in air layer. Therefore

the Hermann orientation factor was reduced. However

in the wet-spinning process

the crystallization occurred immediately after extrusion

the drawing force induced the increasing of the orientation for crystalline region. The model for the evolution of the aggregation state of PAN molecular chains was proposed.

关键词

PAN初生纤维干湿法湿法晶区取向结构

Keywords

PAN nascent fiberDry jet wet-spinningWet-spinningHermann orientation factor

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Beijing University of Chemical Technology,State Key Laboratory of Organic-Inorganic Composites

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