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首页> 外文期刊>Journal of Applied Polymer Science >Melt functionalization of EVA copolymers with maleic anhydride
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Melt functionalization of EVA copolymers with maleic anhydride

机译：EVA共聚物与马来酸酐的熔融官能化

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摘要

Ethylene vinyl acetate (EVA) copolymers with different amounts of vinyl acetate were melt-functionalized with maleic anhydride. The effect of benzoyl peroxide, t-butyl perbenzoate, and dicumyl peroxide (DCP) as free-radical initiators on the functionalization performance was studied. The crosslinking reactions occur to a larger extent than in polyethylene, indicating that the vinyl acetate groups favor the formation of free radicals. From all the experiments performed in this study, the recommended initiation system to achieve the best values of the functionalization degree and the lower gel content involves the use of DCP in a concentration of about 0.3 wt% and a maleic anhydride concentration around 5.0 wt%. From FTIR and TGA analyses, it is suggested that the hydrogen abstraction in the EVA copolymers occurs both in the methyl group of the acetate moiety and in the tertiary C - H. The free radicals generated in the tertiary C - H react with maleic anhydride in a higher proportion.
机译：将具有不同乙酸乙烯酯含量的乙烯乙酸乙烯酯（EVA）共聚物用马来酸酐熔融官能化。研究了过氧化苯甲酰，过苯甲酸叔丁酯和过氧化二枯基（DCP）作为自由基引发剂对官能化性能的影响。交联反应发生的程度比聚乙烯大，表明乙酸乙烯酯基团有利于自由基的形成。从该研究中进行的所有实验中，为获得最佳官能化度值和较低凝胶含量的推荐引发体系涉及以约0.3 wt％的浓度使用DCP和以约5.0 wt％的顺丁烯二酸酐的浓度。根据FTIR和TGA分析，认为EVA共聚物中的氢提取既发生在乙酸酯部分的甲基中，也发生在叔C-H中。叔C-H中产生的自由基与马来酸酐反应。更高的比例。

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