Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 1-9.doi: 10.13475/j.fzxb.20200200209

• Fiber Materials •     Next Articles

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 E-mail:zhangym@dhu.edu.cn

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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

CLC Number: 

  • TS102

Fig.1

Creep strain-time curves and selected SAXS patterns of HT polyester fiber at 80 ℃ and 200 ℃"

Tab.1

Creep parameters of HT polyester fibers at different temperatures"

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

Fig.2

1-D SAXS profiles along q1 direction (a) and 1-D electron density correlation function at different strains (b) at 200 ℃"

Fig.3

Evolution of different lamellar structure parameters of HT polyester industrial yarn. (a) Lamellar structure evolutions with different creep time at 80 ℃; (b) Lamellar structure evolutions with different creep time at 200 ℃;(c) Microscopic long period strain and macroscopic fiber strain at different time; (d) Microscopic long period strain and corresponding macroscopic creep strain during zone II"

Fig.4

Evolutions of lamellar tilting angle with creep time of HT polyester at different temperatures (four-spot pattern part)"

Fig.5

2-D WAXS patterns of HT polyester during creep deformation process with different creep temperature"

Fig.6

1-D WAXS curves of HT polyester during creep deformation process at different creep temperature"

Fig.7

Evolutions of crystallite parameters of HT polyester with creep time at different temperature"

Fig.8

Evolutions of crystalline orientation,amorphous orientation and birefringence of HT polyester with creep time"

Fig.9

Physical molecular model of HT polyester during creep rupture process"

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