Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (03): 20-25.doi: 10.13475/j.fzxb.20190406406

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of polyacrylonitrile/polyurethane transparent film

LI Guoqing1, LI Pingping1, LIU Hanlin1, LI Ni1,2()   

  1. 1. College of Textile Science and Engineering(International Silk Institute), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2019-04-23 Revised:2019-12-18 Online:2020-03-15 Published:2020-03-27
  • Contact: LI Ni E-mail:lini@zstu.edu.cn

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Abstract:

This research aims to improve the mechanical properties of polyacrylonitrile/polyurethane(PAN/PU)nanofiber transparent membrane. During electrospinning, rotating drum was used as collector. Transparent PU film reinforced by PAN nanofibers (PANNFs/PU film)were prepared by following heating treatment. The morphology,structure and mechanical properties of the films were characterized by scanning electron microscope, infrared spectrometer, multifunctional stretcher. The results show that the fiber arrangement in PAN/PU films along the drum rotating direction becomes obvious with the increase of drum rotating speed. The mechanical properties of PANNFs/PU film are improved significantly through heat treatment. When the rotating speed is 1 500 r/min, the breaking stress of the PAN/PU membrane along the drum rotating direction is 103.3 MPa, and that of the PANNFs-PU film along the drum rotating direction reaches 306.8 MPa coupled with a high breaking strain of 163.1%. Compared with PAN/PU porous membrane, the mechanical properties of PANNFs/PU transparent membrane are significantly improved.

Key words: nanofiber, polyacrylonitrile, polyurethane, porous film, transparent films, electrospinning

CLC Number: 

  • TQ342.93

Fig.1

Appearance change of film"

Fig.2

FT-IR spectra of PAN nanofiber film, PU nanofiber film, PAN/PU nanofiber porous film and PANNFs/PU transparent film"

Fig.3

SEM images of PAN/PU porous film prepared under different drum rotating velocity"

Tab.1

Fiber diameter of PAN/PU porous film prepared under different drum rotating velocity"

转速/
(r·min-1)		 纤维直径
最大值/nm 最小值/nm 平均值/nm CV值/%
0 418.62 248.45 315.89 11.53
500 393.48 242.29 308.87 9.83
1 000 403.59 268.11 324.58 10.20
1 500 411.07 224.82 319.63 13.54
2 000 437.04 246.55 329.63 12.65

Fig.4

Mechanical properties of PAN/PU porous film prepared under different drum rotating velocity. (a) Stretched in parallel direction; (b) Stretched in vertical direction"

Tab.2

Mechanical properties of orientational PAN/PU and PANNFs/PU nanofiber films at different rotating speed"

转速/
(r·min-1)		 PAN/PU PANNFs/PU
断裂应力/MPa 断裂应变/% 初始模量/GPa 断裂应力/MPa 断裂应变/% 初始模量/GPa
平行 垂直 平行 垂直 平行 垂直 平行 垂直 平行 垂直 平行 垂直
0 77.1 128.6 0.27 197.8 307.6 1.26
500 79.4 41.4 117.0 112.6 0.35 0.15 222.8 151.1 81.7 103.4 1.66 1.12
1 000 94.8 32.7 101.6 121.3 0.43 0.11 264.1 163.9 35.5 87.3 2.78 1.06
1 500 103.3 23.2 134.5 146.1 0.59 0.13 306.8 159.8 40.1 163.1 3.11 0.86
2 000 86.8 19.6 112.4 153.7 0.24 0.09 293.7 158.3 35.4 131.7 3.47 1.04

Fig. 5

Mechanical properties of PU film reinforced by PAN nanofiber under different drum rotating velocity. (a) Stretched in parallel direction; (b) Stretched in vertical direction"

Fig.6

Illustration of PU film reinforced by PAN nanofiber. (a) Random orientation; (b) Perfect orientation"

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