【摘要】 本文以硅橡胶为基材深入研究了与丙烯酸共辐射接校中的酸效应。结果表明,甲醇-丙烯酸与硅橡胶共辐射接枝体系中酸效应在不同吸收剂量范围是不同的。<5kGy时酸有敏化作用,在5—13kGy范围酸有相反的效果。在所有剂量范围内单体浓度、剂量率等因素对辐射接枝反应的酸效应无明显影响。除吸收剂量外,酸效应还与基材组成、单体与溶剂类型以及接枝方法等多种因素有关。更多还原

【Abstract】 Radiation-induced grafting is a potential method for modification ofpolymers, for example, highly hydrated polymeric surfaces may be biocompatiblc andthomboresistant. It is well known that addition of mineral acid to some graftingsolution enhanced the radiation grafting yield of some polyolefins. But it turnsout not to be the case in all conditions. Some monomers(such as N-VP)can be graftedonto some polymers(such as SPEU)only in basic medium. That means that the acideffect in grafting systems depends on many effects such as component of matrix, typeof monomers and solvents, method of irradiation, absorbed dose and so on. In thiswork, the cuves of grafting yield as a function of absorbed dose showed that therewere about two regions of dose: lower than 5 kGy, the grafting yield of AA on sili-cone robber was enhanced by acid; the other region, dose growing up to about 13kGy, the opposite results were obtained. In acid enhancing region of dose the tendencyof grafting yield as a function of dose rate and monomer concentration was notinfluenced by whether the acid existed. The mechanism was dtscussed as well.更多还原