Study on structure and wear resistance of PTFE modified by irradiation

doi:10.19491/j.issn.1001-9278.2025.07.003

Abstract

Abstract:

This study reported an investigation on the effects of gamma⁃ray irradiation modification above the melting point on the wear resistance of polytetrafluoroethylene （PTFE）. The crystalline structure and tribological properties of PTFE before and after irradiation were characterized using differential scanning calorimetry， scanning electron microscopy， X⁃ray diffraction， Fourier⁃transform infrared spectroscopy， and tribological testing. Results demonstrated that irradiation significantly enhanced PTFE's crystallinity. Under optimized conditions， the modified PTFE exhibits a 3.31⁃fold improvement in wear resistance and a 78 % reduction in friction coefficient， demonstrating superior tribological performance.

Key words: polytetrafluoroethylene, irradiation modification, crystal structure, friction and wear property

CLC Number:

TQ325.4

HUANG Geng, Bekbolatovich Sagin Abay, WU Daming, WANG Xiaojie, GAO Xiaolong, SUN Jingyao, HUANG Yao, XU Hong, ZHENG Xiuting. Study on structure and wear resistance of PTFE modified by irradiation[J]. China Plastics, 2025, 39(7): 12-16.

Figures/Tables 11

Fig. 1. DSC curves of PTFE before and after irradiation

样品	结晶温度/℃	热焓/J·g^-1	结晶度/%	M_n
PTFE	317.61	46.75	60.81	0.82×10⁶
RM⁃PTFE	316.67	49.85	77.93	0.58×10⁶

Tab.1. Changes of crystallization temperature and enthalpy before and after irradiation

Fig.2. SEM of PTFE before and after irradiation

Fig. 3. XRD chart of PTFE before and after irradiation

名称

衍射角/°

晶面指数

晶胞间距/

晶粒尺寸/

Tab.2. Crystal structure parameters

Fig.4. FTIR of PTFE before and after irradiation

Fig.5. Wear under different conditions

Fig.6. Linear wear rate under different pressures

Fig.7. Coefficient of friction under different pressures

Fig.8. Surface topography before and after wear

Fig.9. Mechanism model of irradiation modified PTFE crystal structure change

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