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Effects of polymethylvinylsilicone oil with side tetraphenylphenyl groups on the radiation resistance of addition‐type silicone rubber
Author(s) -
Jiang Zhigang,
Zhang Jie,
Feng Shengyu
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26029
Subject(s) - silicone rubber , natural rubber , materials science , silicone oil , radiation resistance , irradiation , toluene , silicone , swelling , composite material , polymer chemistry , chemistry , organic chemistry , physics , nuclear physics
Polymethylvinylsilicone oil with side tetraphenylphenyl groups (called C 2 gum for short) as a low molecular additive was used in two kinds of addition‐type silicone rubber, polymethylvinyl silicone rubber and poly (dimethyl‐diphenyl) silicone rubber, and the radiation resistance of silicone rubbers obtained was investigated by γ‐rays radiation with the dose rate of 117 Gy/min at doses up to 350, 500, and 850 kGy, respectively. Moreover, the average molecular weight between crosslinks and mechanical properties of silicone rubbers after irradiated in air and N 2 were determined by toluene‐swelling method and on a XLS‐A rubber test instrument, respectively. The results show that C 2 gum can effectively improve the radiation resistance of silicone rubber. When C 2 gum is used in poly(dimethyl‐diphenyl) silicone rubber, phenyl groups and tetraphenylphenyl groups may have synergistic effect, and the radiation resistance is improved greatly. The suitable amount of C 2 gum used in silicone rubber is 10– 14 phr. The crosslinking density of vulcanizates irradiated in N 2 is higher than that of vulcanizates irradiated in air because of the oxidative degradation. The radiation protection mechanism of C 2 gum was also discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 4144–4148, 2007