硅橡胶的辐射交联研究(Ⅱ)——凝胶生成动力学

STUDY ON THE RADIATION CROSSLINKING OF SILICONE RUBBER Ⅱ——THE KINETICS OF GEI FORMATION

本文研究了二甲基和不同乙烯基含量的甲基乙烯基硅橡胶的辐射交联凝胶生成动力学。在0-100kGy剂量范围,从实验上证实了单位剂量交联度q_0为常数,而溶胶分子量M_(v(s))与剂量关系符合 M_(v(s))=M°_(v(s))·aR^(-b)对二甲基硅橡胶(DMSR),b值为0.70。对不同乙烯基含量的甲基乙烯基硅橡胶(MVSR),b值为0.77～0.80,近似不变。从凝胶生成的动力学方程可得 ln((1-S) /S)=AR~β+C对DMSRβ值为0.30。对不同乙烯基含量的MVSRβ值为0.20～0.23。

In this paper, the kinetics of gel formation in the radiation crosslin-king reaction was investigated for dimethyl silicone rubber (DMSR) and methylvinyl silicone rubber (MVSR) with different vinyl contents. At 0--100 kGy doserange, the following results can be obtained by experiments, namely the degree ofcrosslinking per unit dose (q_0) is constant, and the relationship between sol molecularweight (M_(v(s)) and dose (R) may be described as following equation: M_(v(s))=M_(v(s))aR^(-b)b value is 0 .70 for DMSR, and 0.77--0. 80 for MVSR with various vinyl content.From the kinetics equation of gel formation, the distribution of gel and sol in theprocess of radiation crosslinking of silicone rubber can be discussed according to thefollowing eq.:1n 1-S/S=AR~β+Cβ value is 0. 30 for DMSR and 0. 20--0.23 for MVSR with various vinyl content.