Abstract
AbstractPolyvinylsilicone oil with condensed aromatics (called C1 gum) was synthesized by Diels‐Alder reaction of polyvinylsilicone oil and acenaphthenecyclone, and was used as an additive in heat‐curable silicone rubber. The resistance to irradiation of the silicone rubber obtained was investigated by γ‐rays at doses up to 300, 500, and 1000 kGy in vacuum. The dose rate was 150 kGy/min. After irradiation, the average molecular weight between crosslinks (Mc) and mechanical properties of the silicone rubber were determined. The results show that C1 gum can effectively improve the radiation resistance of silicone rubber. When the amount of C1 gum used in silicone rubber changes from 2 to 14 parts per hundred silicone gum, the radiation protection effects increase with increasing amount of C1 gum. The radiation protection mechanism of C1 gum was also discussed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1937–1942, 2006
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