Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 7-11.doi: 10.13475/j.fzxb.20200708006

• Fiber Materials • Previous Articles     Next Articles

Preparation, structure and properties of high-strength high-modulus polyimide fibers containing benzimidazole moiety

ZHENG Sensen1,2, GUO Tao3, DONG Jie1,2, WANG Shihua3, ZHANG Qinghua1,2()   

  1. 1. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
    2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
    3. Jiangsu Aoshen Hi-Tech Materials Co., Ltd., Lianyungang, Jiangsu 222000, China
  • Received:2020-07-30 Revised:2020-11-03 Online:2021-02-15 Published:2021-02-23
  • Contact: ZHANG Qinghua E-mail:qhzhang@dhu.edu.cn

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Abstract:

In order to improve the mechanical properties of polyimide (PI) fibers and promote their applications for composites, the spinning dopes were synthesized by an aromatic heterocyclic diamine monomer of 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) with rigid polyimide backbones of 3,3',4,4'-biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylene diamine (p-PDA), which were based on a structural design of high-performance polymeric fibers. The PI fibers were prepared via dry-spinning the BPDA-PDA-BIA solution. The relationships between mechanical properties of the fibers and chemical construction and aggregation structure were studied. In addition, the thermal properties and ultraviolet (UV) irradiation resistance of the fibers were evaluated systematically. The results show that the PI fibers reach the optimum tensile strength and initial modulus of 4.04 and 130 GPa, respectively, mainly due to the high orientation of the polymer chains along the fiber direction and the intermolecular hydrogen bonding interactions. The glass-transition and 10%-weight-loss temperature of the PI-4 fiber are 324 and 587 ℃, and the fiber retains 92% of its tensile strength after 168 h of UV irradiation, indicating prominent UV irradiation resistance and excellent thermal stability.

Key words: polyimide fiber, dry spinning, aggregation structure, UV irradiation resistance, high-strength high-modulus

CLC Number: 

  • TB383

Fig.1

Attenuated total reflect FT-IR spectra of PI-0 and PI-4 fiber"

Fig.2

Thermal stability curves of PI-4 fiber measured under nitrogen atmosphere"

Fig.3

DMA curves of PI fibers with different heat-drawing ratios"

Tab.1

Mechanical properties of PI fibers with different heat-drawing ratios"

样品编号 拉伸强度/GPa 初始模量/GPa 断裂伸长率/%
PI-0 0.11±0.01 24±2 40.21±3.82
PI-1 1.40±0.09 60±6 1.89±0.19
PI-2 2.62±0.13 90±8 2.09±0.11
PI-3 3.51±0.11 112±9 2.67±0.28
PI-4 4.04±0.20 130±11 2.86±0.22

Fig.4

Retentions of mechanical properties of PI-4,PBO and Kevlar?49 fibers"

Fig.5

Two dimensional wide angle X-ray diffraction patterns of PI fibers with different heat-drawing ratios"

Fig.6

One dimensional X-ray diffraction patterns of PI fibers with different heat-drawing ratios. (a) Equatorial direction; (b) Meridian direction"

Fig.7

Azimuth scans of PI fibers at 2θ of 9.4°"

Fig.8

Plot of fc versus different heat-drawing ratios of PI fibers"

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