Journal of Radiation Research and Radiation Proces ›› 2015, Vol. 33 ›› Issue (6): 60301-060301.doi: 10.11889/j.1000-3436.2015.rrj.33.060301

• RADIATION CHEMISTRY • Previous Articles     Next Articles

Chemical stability of ethylene-tetra-fluoro-ethylene irradiated by electron beam

LI Jianxi1  SHAN Yongdong2  ZHANG Cong3  CHEN Tao3  LI Linfan3   

  1. 1(CGN DELTA (Jiangsu) Plastic &Chemical Co., Ltd., Suzhou 215400, China)
    2(CGN DELTA (Suzhou) New Materials R & D Co., Ltd., Suzhou 215400, China)
    3(Jiading Campus, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China)
  • Received:2015-09-15 Revised:2015-10-12 Online:2015-12-20 Published:2015-11-17
  • Contact: LI Jianxi E-mail:lijianxi@cgnam.cn
  • About author:LI Jianxi, male, born in October 1983, received a doctor's degree from Shanghai Institute of Applied Physics, CAS, in June 2015, now works as an engineer, and is mainly engaged in radiation processing of polymers

Abstract:

The ethylene tetra-fluoro-ethylene-copolymer (ETFE) sheets were irradiated by electron beam at low dose rate of 20 kGy/h in the air. The absorbed dose range was 0–1600 kGy. The samples irradiated with different absorbed doses were tested and characterized by mechanical properties, infrared spectroscopy, Raman spectroscopy and DSC (differential scanning calorimetry). The results showed that elongation and tensile strength decreased slowly within the dose range of 0–200 kGy, however, it dropped sharply when the dose was more than 400 kGy. The results of infrared spectra showed that the carbonyl index increased with absorbed dose, which indicated that the surface of sample was severely oxidized during irradiation. The results of Raman spectroscopy analysis showed that low dose rate irradiation of electron beam disrupted ETFE molecular chain. DSC test results showed that, with the increasing of the absorbed dose of ETFE, crystallinity and melting point decreased gradually; the crystallinity decreased from 43.2% to 12.6%; and the melting point decreased from 261.3 ℃ to 233.3 ℃.

Key words: Ethylene-tetra-fluoro-ethylene, Low dose rate, Electron beam, Irradiation, Chemical stability

CLC Number: 

  • TL13