Study on plasma surface modification and mechanism of PTFE fiber

doi:10.19491/j.issn.1001-9278.2024.06.010

Abstract

Abstract:

In this paper， the effect of plasma surface modification of PTFE fibers was investigated through contact angle， monofilament pull⁃out， and peel strength measurements. The obtained samples were analyzed by means of scanning electron microscopy， Fourier⁃transform infrared spectroscopy， and X⁃ray photoelectron spectroscopy. The results indicated that the plasma surface modification of PTFE fibers promoted higher compatibility and higher adhesion between materials， thus resulting in better performance. The modified PTFE fibers showed an increase in the interface shear strength at first and then decreased with an increase in the time. Such an effect weakened gradually with an increase in the placement time， leading to a failure in the modification effect failed after 24 h.

Key words: polytetrafluoroethylene, plasma, surface modification, reaction mechanism

CLC Number:

TQ342

MA Yiheng, WANG Jianyong. Study on plasma surface modification and mechanism of PTFE fiber[J]. China Plastics, 2024, 38(6): 66-71.

Figures/Tables 15

Fig.1. SY⁃DT01 low⁃temperature plasma

Fig.2. The principle of plasma surface treatment machine

Fig.3. Schematic diagram of the single⁃fiber pull⁃out test

Fig.4. Principle of the peel strength experiment

Fig.5. Experimental sample

Fig.6. Contact angle and testing equipment

Fig.7. The effect of plasma modification on the contact angle of PTFE fibers

Fig.8. Curve of contact angle over time

项目	接触角/°	表面能/ $J · m - 2$
PTFE纤维改性前	123.09	0.027 7
PTFE纤维改性后	94.34	0.048 6
提升率/%	23.36	75.45

项目	接触角/°	表面能/ $J · m - 2$
PTFE纤维改性前	123.09	0.027 7
PTFE纤维改性后	94.34	0.048 6
提升率/%	23.36	75.45

Tab.1. Solid surface energy of PTFE fibers before and after plasma modification

Fig.9. Change in relative shear strength during single⁃fiber pull⁃out test

Fig.10. Infrared spectra before and after PTFE modification

样品	C1s/%	F1s/%	O1s/%
N⁃PTFE	33.33	65.51	1.15
M⁃PTFE	34.14	64.20	1.21

Tab.2. Chemical composition of PTFE fiber surface before and after plasma modification

Fig.11. XPS spectra of PTFE fibers before and after modification

Fig.12. Photos of radial cross⁃sectional morphology of fabric liners before and after modification

Fig.13. Photos of latitudinal cross⁃sectional morphology of fabric liners before and after modification

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