Journal of Radiation Research and Radiation Processing ›› 2020, Vol. 38 ›› Issue (4): 33-38.doi: 10.11889/j.1000-3436.2020.rrj.38.040202

• RADIATION CHEMISTRY • Previous Articles    

Thermal aging properties of irradiated ethylene-tetrafluoroethylene copolymers

CAO Dan1,WANG Changjin1,SHI Congcong2,LI Jianxi1,2()   

  1. 1.CGN -DELTA (Taicang) Testing Technology Co. , Ltd. , Suzhou 215400, China
    2.Life Evaluation and Management Technology Laboratory of Non-Metallical Materials, Suzhou 215400, China
  • Received:2020-01-03 Revised:2020-03-20 Accepted:2020-03-20 Online:2020-08-20 Published:2020-08-13
  • Contact: LI Jianxi E-mail:lijianxi@cgnam.cn
  • About author:CAO Dan (female) was born in October 1988, and obtained her master’s degree from Xi'an Jiaotong University in 2014, engineer

Abstract:

Ethylene-tetrafluoroethylene copolymers (ETFE) were aged at various absorbed doses (60 kGy, 120 kGy, and 180 kGy), and then, they were estimated and characterized by carbon residual rate, tensile test, thermal elongation test, volume resistivity analysis, and Fourier transform infrared (FTIR) spectroscopy. The results showed that the carbon residual rate of these aged samples increased with the absorbed dose while the thermal elongation decreased. With increasing absorbed dose and aging time, the tensile properties of the aged ETFE copolymer samples degraded, which could be attributed to chain breakage. Furthermore, the formation of crosslinking networks led to a change in the volume resistivity of the aged samples. The aging sample with an absorbed dose of 120 kGy showed the highest value and the best insulation performance. In addition, the FTIR results indicated that with increasing aging time, the amorphous structure of the aged samples first increased and then decreased.

Key words: Ethylene-tetrafluoroethylene copolymer, Radiation crosslinking, Thermal aging

CLC Number: 

  • TL13