Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 22-27.doi: 10.13475/j.fzxb.20180807006

• Fiber Materials • Previous Articles     Next Articles

Influence of oxygen plasma modification on surface properties of polyimide fiber

DU Xiaodong1,2, LIN Fangbing1,2, JIANG Jinhua1,2(), CHEN Nanliang1,2, LIU Yanping2   

  1. 1. Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai 201620, China
    2. College of Textiles, Donghua University, Shanghai 201620, China
  • Received:2018-08-27 Revised:2019-01-24 Online:2019-09-15 Published:2019-09-23
  • Contact: JIANG Jinhua E-mail:jiangjinhua@dhu.edu.cn

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Abstract:

In order to enhance the interface adhesion performance, polyimide fiber was modified by oxygen plasma for different time periods and the influence of modification on the surface properties of polyimide fiber was analyzed by X-ray photoelectron spectroscopy, field emission scanning electron microscopy, single fiber fragmentation method and contact angle measurement. The results show that the surface properties of polyimide fibers are improved remarkably after 4 min treatment under the conditions of oxygen plasma modification with pressure of 10 Pa and power of 100 W. At the treatment conditions, the content ratio of O to C on the surface is increased by 108%, compared with untreated fibers. The contents of C—O and C=O increase from 7.6% and 10.3% to 20.4% and 19.2%, respectively. The surface micro-cracks are uniform and dense. The interfacial shear strength between fiber and resin increases from 29.88 MPa to 46.13 MPa,and its enhancement rate is 54%. And the hydrophobic surface is improved to hydrophilic surface, the contact angle reduces from about 110° to below 55°.

Key words: polyimide fiber, oxygen plasma modification, surface chemical composition, surface morphology, interface adhesion, wettability

CLC Number: 

  • TS195.6

Fig.1

Weibull fitting plots of fiber strength after oxygen plasma modification at different times periods. (a)Untreated;(b) Treatment for 2 min;(c) Treatment for 4 min;(d) Treatment for 6 min"

Tab.1

Shape parameters and mechanical properties of oxygen plasma modified fibers"

改性时间/
min		 λ 断裂强度/
GPa		 初始弹性
模量/GPa		 断裂伸长
率/%
未处理 13.07 0.93 9.26 15.43
2 9.08 0.91 9.25 14.94
4 9.79 0.88 8.46 15.92
6 16.44 0.83 8.42 14.86

Fig.2

SEM images of untreated and oxygen plasma modified fibers(×50 000). (a) Untreated;(b) Treatment for 2 min; (c) Treatment for 4 min;(d) Treatment for 6 min"

Tab.2

Analysis of chemical composition of oxygen plasma modified fiber surfaces"

改性时间/
min		 元素含量/% O与C
含量比		 N与C
含量比
C O N
未处理 77.4 19.2 3.4 0.25 0.04
2 70.4 24.3 5.3 0.35 0.08
4 62.5 32.6 4.9 0.52 0.08
6 68.4 24.3 7.3 0.36 0.11

Fig.3

XPS C1s spectra of untreated and modified oxygen plasma modified fibers. (a)Untreated;(b)Treatment for 2 min;(c)Treatment for 4 min;(d)Treatment for 6 min"

Tab.3

Surface functional group content of oxygen plasma modified fiber surfaces"

改性时间/
min		 官能基团含量/%
C—C C—N C—O C＝O
未处理 46.3 35.8 7.6 10.3
2 38.0 28.6 21.6 11.8
4 31.5 28.9 20.4 19.2
6 38.9 28.0 17.0 16.1

Tab.4

Interfacial shear strength calculation result of oxygen plasma modified fibers"

改性时间/
min		 Lc/
μm		 τ/
MPa		 剪切强度
增长率/%
未处理 276.41 29.88
2 231.70 40.96 37
4 196.02 46.13 54
6 185.32 38.53 29

Fig.4

Microscopic observation of droplet shape on polyimide fiber. (a)Untreated;(b) Treatment for 4 min"

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