纺织学报 ›› 2019, Vol. 40 ›› Issue (11): 9-12.doi: 10.13475/j.fzxb.20181102705

• 纤维材料 • 上一篇    下一篇

热处理对热致液晶聚芳酯纤维结构与性能的影响

杨帆1,2, 刘俊华1,2, 边昂挺1,2, 王燕萍1,2(), 钱琦渊3, 倪建华2, 夏于旻1,2, 何勇1,4, 王依民1,2   

  1. 1.东华大学 纤维材料改性国家重点实验室, 上海 201620
    2.东华大学 材料科学与工程学院, 上海 201620
    3.无锡金通高纤股份有限公司, 江苏 无锡 214161
    4.东华大学 纺织科技创新中心, 上海 201620
  • 收稿日期:2018-11-12 修回日期:2019-08-16 出版日期:2019-11-15 发布日期:2019-11-26
  • 通讯作者: 王燕萍
  • 作者简介:杨帆(1991—),男,硕士。主要研究方向为聚芳酯纤维的制备及其性能。

Influence of heat treatment on structure and properties of thermotropic liquid crystalline polyarylate fiber

YANG Fan1,2, LIU Junhua1,2, BIAN Angting1,2, WANG Yanping1,2(), QIAN Qiyuan3, NI Jianhua2, XIA Yumin1,2, HE Yong1,4, WANG Yimin1,2   

  1. 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
    2. College of Material Science and Engineering, Donghua University, Shanghai 201620, China
    3. Wuxi Jintong High Performance Fiber Co., Ltd., Wuxi, Jiangsu 214161, China
    4. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2018-11-12 Revised:2019-08-16 Online:2019-11-15 Published:2019-11-26
  • Contact: WANG Yanping

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摘要：

针对热致液晶聚芳酯(TLCPAR)初生纤维结构不稳定、强度不高的问题,对其进行热处理以提高纤维分子质量,进而提高纤维的强度。将处于松弛状态的TLCPAR纤维置于热处理箱中,在不同的热处理温度和时间下进行热处理。借助广角X射线衍射仪、纱线强伸度仪测试与分析纤维的结晶度、晶粒尺寸、晶区取向以及纤维力学性能的变化。结果表明:热处理后TLCPAR纤维的(110)晶面和(211)晶面的晶粒尺寸显著增加,230 ℃热处理48 h后纤维的结晶度增加了37.1%,取向度仅下降2%,说明TLCPAR纤维中大分子链的堆砌更有序、更紧密;热处理后结构变化使TLCPAR纤维断裂强度增加了86.8%,弹性模量增加了20.9%。

关键词: 聚芳酯纤维, 热致液晶聚芳酯, 热处理, 结晶度, 力学性能

Abstract:

In view of the unstable structure and low strength of thermotropic liquid crystalline polyarylate (TLCPAR) as-spun fiber, the heat treatment was carried out to increase the molecular weight and therefore improve the strength of the fiber. The TLCPAR as-spun fiber with relaxed state was treated under the conditions of different heat treatment temperatures and time in nitrogen gas flow. The wide angle X-ray diffraction was adopted to analyze the crystallinity, crystalline size and orientation and the mechanical properties were tested by yarn strength tester. The results show that after heat treatment, the crystalline size of the (110) and (211) planes of the TLCPAR fiber has a significant increase. After being subjected to the heat treatment of 230 ℃ for 48 h, the crystallinity of the fiber increases by 37.1%, and the crystalline orientation decreases only 2%. It is shown that the molecular chains are stacked more orderly and closely after heat treatment. The change in structure of TLCPAR fiber results in an increase of 86.8% in strength and 20.9% in elastic modulus.

Key words: polyarylate fiber, thermotropic liquid crystalline polyarylate, heat treatment, crystallinity, mechanical property

中图分类号: 

  • TQ342.724

图1

热处理前后TLCPAR纤维的二维WAXD图"

图2

热处理前后TLCPAR纤维的一维WAXD曲线"

图3

TLCPAR纤维晶粒尺寸随热处理温度的变化"

图4

TLCPAR纤维结晶度随热处理温度的变化"

表1

不同热处理温度下TLCPAR纤维的晶区取向度"

时间/h 取向度/%
180 ℃ 200 ℃ 205 ℃ 210 ℃ 215 ℃ 220 ℃ 225 ℃ 230 ℃
6 91 91 91 91 91 90 91 91
12 91 91 91 90 91 90 90 90
24 91 90 91 91 91 90 90 90
36 90 91 90 90 90 90 89 89
48 91 90 90 90 90 89 90 89

图5

TLCPAR纤维强度随热处理温度的变化"

图6

TLCPAR纤维弹性模量随热处理时间的变化"

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