纺织学报 ›› 2020, Vol. 41 ›› Issue (11): 1-9.doi: 10.13475/j.fzxb.20200200209

• 纤维材料 •    下一篇

高强型聚酯工业丝在不同温度下的蠕变断裂机制

陈康1, 蒋权2, 姬洪1, 张阳1, 宋明根2, 张玉梅1(), 王华平1   

  1. 1.东华大学 纤维材料改性国家重点实验室, 上海 201620
    2.浙江尤夫高新纤维股份有限公司, 浙江 湖州 313017
  • 收稿日期:2020-02-01 修回日期:2020-05-27 出版日期:2020-11-15 发布日期:2020-11-26
  • 通讯作者: 张玉梅
  • 作者简介:陈康(1993—),男,博士生。主要研究方向为聚酯工业丝应用特性及其构效关系研究。
  • 基金资助:
    国家重点研发计划项目(2016YFB0303004);中央高校基本科研业务费专项资金资助项目(CUSF-DH-D-2018016);湖州市南太湖精英计划创新团队项目(2016HJYLB-03-B);中国纺织工业联合会应用基础研究项目(J201301)

Temperature related creep rupture mechanism of high-tenacity polyester industrial fiber

CHEN Kang1, JIANG Quan2, JI Hong1, ZHANG Yang1, SONG Minggen2, ZHANG Yumei1(), WANG Huaping1   

  1. 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
    2. Zhejiang Unifull Industrial Fiber Co., Ltd., Huzhou, Zhejiang 313017, China
  • Received:2020-02-01 Revised:2020-05-27 Online:2020-11-15 Published:2020-11-26
  • Contact: ZHANG Yumei

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摘要：

为探究高强型聚酯工业丝在不同温度下的蠕变断裂机制,采用在线小角X射线散射和广角X射线散射方法对低温(80 ℃)及高温(200 ℃)条件下聚酯工业丝蠕变断裂过程中的微观结构演变进行研究。结果表明:高强型聚酯工业丝的蠕变断裂可分为3个阶段,即负荷加载的拉伸阶段、蠕变形变阶段及加速形变阶段;在80 ℃低温下蠕变断裂的前2个阶段中,部分倾斜片晶转变成未倾斜片晶,且倾斜部分片晶偏离角不断增大,而在加速阶段,伸直的非晶区分子链发生断裂,周期性的片晶堆叠结构遭到破坏;在200 ℃高温下蠕变断裂的前2个阶段中,片晶层表面始终保持倾斜状态且倾斜角逐渐减小,而在加速阶段中,高度取向的非晶区分子链对晶区结构施加应力,晶区表面分子链被拉出而遭到破坏,导致周期性的片晶堆叠结构遭到破坏。

关键词: 聚酯工业丝, 蠕变断裂机制, 结晶结构, 片晶结构, 蠕变过程

Abstract:

In order to investigate the creep rupture mechanism of high-tenacity polyester industrial fibers at different temperatures, in-situ small-angle X-ray scattering and wide-angle X-ray scattering characterizations were conducted on a high tenacity polyester fiber during creep rupture process at 80 ℃ and 200 ℃, respectively. The creep strain-time curves were categorised into tensile zone (I), creep deformation zone (II) and creep rupture zone (III). For the low-temperature creep rupture, a small part of lamellar surfaces was transformed into normal surface, and the tilting angle of the inclined lamellar surface increased with time in the first two zones. In creep rupture zone, the fully stretched amorphous molecular chains were broken, resulting in the disappearance of the periodic lamellar structure. For the high-temperature creep rupture process on the other hand, the surface of the lamellar structure always maintained an inclined state and the lamellar tilting angle gradually decreased in the first two zones. Highly-oriented molecular chains in the amorphous region exerted stress on the crystal region, which causes the surface chains in the amorphous region and the crystal region to be pulled out, resulting in the fracture of crystalline structure and the lamellar stack structure was damaged in creep rupture zone.

Key words: polyester industrial fiber, creep rupture mechanism, crystalline structure, lamellar structure, creep process

中图分类号: 

  • TS102

图1

80 和 200 ℃下HT聚酯工业丝蠕变断裂曲线及对应的二维SAXS图谱"

表1

HT聚酯工业丝不同温度下的蠕变形变参数"

蠕变温度/
℃		 初始蠕变形
变率/%		 总蠕变形
变率/%		 蠕变过程中发生
的形变率/%
80 15.5 20.6 5.1
200 16.4 23.1 6.7

图2

200 ℃时HT聚酯工业丝的一维电子云密度及相关函数"

图3

HT聚酯工业丝不同片晶结构参数的演变"

图4

HT聚酯工业丝不同蠕变温度条件下片晶倾斜角随时间的变化(四点式部分)"

图5

HT聚酯工业丝在不同蠕变温度下的二维WAXS图"

图6

HT聚酯工业丝在不同蠕变温度条件下的一维WAXS曲线"

图7

HT聚酯工业丝在不同温度条件下晶区结构参数随蠕变时间的演变"

图8

HT聚酯工业丝晶区取向因子、非晶区取向因子及双折射率随蠕变时间的演变"

图9

HT聚酯工业丝蠕变及蠕变断裂过程中微观结构示意图"

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