Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (04): 15-20.doi: 10.13475/j.fzxb.20180506706

• Fiber Materials • Previous Articles     Next Articles

Influence of N,N-dimethylacetamide/CaCl2 system on structure and properties of thermotropic liquid crystal polyarylate fibers

LIU Bingqian1, SHENG Dan2, PAN Heng1, CAO Genyang1()   

  1. 1. State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan,Hubei 430200, China
    2. School of Textiles and Clothing, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2018-05-28 Revised:2019-01-03 Online:2019-04-15 Published:2019-04-16
  • Contact: CAO Genyang E-mail:genyang.cao@wtu.edu.cn

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Abstract:

In order to improve the interfacial bonding property between thermotropic liquid crystal polyarylate (TLCP) fibers and matrix material while maintaining the excellent thermal and mechanical properties of TLCP fibers, TLCP/polyurethane composites were prepared by surface modification of TLCP fibers with N,N-dimethylacetamide/calcium chloride (DMAc/CaCl2) system. The TLCP fibers before and after modification were characterized and analyzed by means of single fiber universal tester, scanning electron microscope, atomic force microscope, Fourier transform infrared spectrometer, X-ray diffraction, synchronized thermal analyzer and universal material testing machine. The results show that, after being modified with DMAc/CaCl2, TLCP fibers have increased surface fringes, and the average roughness increases from 96.42 to 438.60 nm. The interfacial bonding property of the modified TLCP fabric/polyurethane composites is improved significantly, and the average peeling strength increases from 0.71 N/mm to 1.14 N/mm. The modified TLCP fibers have no obvious change in the molecular structure and the crystal structure, and the crystallinity reduces from 69.00% to 64.45%. When the DMAc volume fraction does not exceed 30%, the mechanical properties of the fibers are not significantly damaged.

Key words: thermotropic liquid crystal polyarylate fiber, N, N-dimethylacetamide/calcium chloride system, surface modification, interface property, mechanical property

CLC Number: 

  • TQ342.724

Tab.1

Effect of volume fraction of DMAc on mechanical properties of TLCP fibers"

DMAc体积
分数/%		 断裂强度 断裂伸长率 断裂功
平均值/(cN·dtex-1) CV值/% 平均值/% CV值/% 平均值/(cN·cm) CV值/%
0 27.81 6.69 3.00 8.61 29.72 14.11
10 27.37 8.76 2.70 5.23 27.11 14.10
30 26.81 7.19 2.68 7.60 27.33 17.82
50 25.40 7.24 2.49 7.60 24.21 17.57
70 24.48 10.69 2.36 8.34 22.28 20.36
90 24.40 7.68 2.36 8.06 22.11 16.40

Fig.1

SEM and AFM surface images of TLCP fibers before and after DMAc/CaCl2 system modification. (a) SEM image of unmodified TLCP (×8 000); (b) SEM image of modified TLCP (×8 000); (c) AFM image of unmodified TLCP; (d) AFM image of modified TLCP"

Fig.2

Infrared spectra of TLCP fibers before and after DMAc/CaCl2 system modification"

Fig.3

XRD curves of TLCP fibers before and after DMAc/CaCl2 system modification"

Fig.4

tanδ curves of TLCP fibers before and after DMAc/CaCl2 system modification"

Fig.5

TG curves of TLCP fibers before and after DMAc/CaCl2 system modification"

Fig.6

Peeling strength of TLCP fabric/PU composite"

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