Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (01): 14-18.doi: 10.13475/j.fzxb.20180301705

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of modified polytetrafluoroethylene fiber by oxidation self-polymerization of dopamine

JIA Huiying, JIANG Zhiqing, MA Jianwei, JIANG Liang, CHEN Shaojuan()   

  1. College of Textiles and Clothing, Qingdao University, Qingdao, Shandong 266071, China
  • Received:2018-03-06 Revised:2018-07-26 Online:2019-01-15 Published:2019-01-18
  • Contact: CHEN Shaojuan E-mail:qdchshj@126.com

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Abstract:

In order to improve the surface performance in hydrophilicity of polytetrafluoroethylene fibers , dopamine was employed to modify polytetrafluoroethylene fibers by oxidation self-polymerization. The effect of different treatment time for modifying polytetrafluoroethylene fibers was analyzed. Scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectrometer and water contact angle (WCA) tester were employed to analyze the surface morphology and the chemical structures of the modified polytetrafluoroethylene fibers. The binding fastness of the fibers to dopamine was analyzed by testing the elution absorbance of the modified fibers in different solutions.The results show that a dense layer of polydopamine is formed on polytetrafluoroethylene fibers with the increase in modification time, and the WCA decreases gradually from 120° to the platform of 69° when the treatment time is up to 24 h. The modified polytetrafluoroethylene fibers introduces hydrophilic groups such as —COOH and —NH2, and the hydrophilicity of the fibers are improved obviously. The binding fastness between fiber and polydopamine is stable.

Key words: polytetrafluoroethylene, dopamine, hydrophilicity, binding fastness

CLC Number: 

  • TS102.6

Fig.1

Flow chart of modification of PTFE with dopamine"

Fig.2

Changes of surface color of PTFE fibers after modification"

Fig.3

SEM images of PTFE fibers before and after modification. (a) Unmodified fiber; (b) Soaked for 6 h; (c) Soaked for 12 h; (d) Soaked for 18 h; (e) Soaked for 24 h; (f) Soaked for 30 h"

Fig.4

AFM image of PTFE fibers before (a) and after (b) modification"

Fig.5

Infrared spectra of PTFE fiber before and after modification"

Fig.6

Changes in contact angle of fibers at different treatment times"

Fig.7

Absorbance of modified PTFE fiber in different liquids."

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