Yao Yuliang, Wei Yi, Fan Yong, Fu Engang
State Key Laboratory of Nuclear Physics and Technology, Department of Technical Physics, School of Physics, Peking University, Beijing 100871, PR China.
Soft Matter. 2024 Jul 3;20(26):5105-5112. doi: 10.1039/d4sm00359d.
The surface of polytetrafluoroethylene (PTFE) bulk materials was modified by irradiation at high temperatures using a 1.2 MeV electron beam. The mass wear rate was decreased from 2.5 × 10 g N m to 0.08 × 10 g N m, and the hardness was increased from 33.2 MPa to 93.9 MPa. The yield strength was increased from 12.1 MPa to 25.8 MPa and Young's modulus was enhanced from 101 MPa to 261 MPa. The use of electron beam irradiation on PTFE at high temperature is an effective modification method to significantly improve its wear resistance and hardness, and increase the elastic response range of PTFE. The chemical reaction induced by electron irradiation at high temperature changes the molecular structure of the PTFE bulk material from highly linear to a network, thus improving the surface mechanical properties of PTFE.
使用1.2 MeV电子束在高温下对聚四氟乙烯（PTFE）块状材料的表面进行改性。质量磨损率从2.5×10 g N m降至0.08×10 g N m，硬度从33.2 MPa提高到93.9 MPa。屈服强度从12.1 MPa提高到25.8 MPa，杨氏模量从101 MPa提高到261 MPa。在高温下对PTFE使用电子束辐照是一种有效的改性方法，可显著提高其耐磨性和硬度，并增加PTFE的弹性响应范围。高温下电子辐照引发的化学反应将PTFE块状材料的分子结构从高度线性变为网络状，从而改善了PTFE的表面机械性能。
