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首页> 外文期刊>Journal of Applied Polymer Science >Effect of different curing systems on heat shrinkability and mechanical properties of ethylene vinyl acetate/epoxidized natural rubber blends
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Effect of different curing systems on heat shrinkability and mechanical properties of ethylene vinyl acetate/epoxidized natural rubber blends

机译：不同硫化体系对乙烯醋酸乙烯酯/环氧化天然橡胶共混物热收缩率和力学性能的影响

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Ethylene vinyl acetate (EVA)/epoxidized natural rubber (ENR) blends containing 10 and 30 wt % ENR were prepared by using an internal mixer. Five different types of curing systems were employed: dicumyl peroxide (DCP), sulfur (S), phenolic resin (Ph), DCP + S, and DCP + Ph. DCP could crosslink with both EVA and ENR while S and Ph were curing agents for ENR. The DCP system provided the lowest tensile properties and tear strength because of low crosslinking in ENR phase. Addition of sulfur or phenolic resin increased the mechanical properties due to a better vulcanization of the rubber phase. The mechanical properties of the blends decreased with increasing ENR content. The rubber particle size in the blends containing 30% ENR played a more important role in the mechanical properties than the blends containing 10% ENR. ENR particle size did not affect heat shrinkability of EVA and a well vulcanized rubber phase was not required for high heat shrinkage. Furthermore, heat shrinkage of the blends slightly changed as the ENR content increased for all curing systems. With regard to the mechanical properties and heat shrinkability, the most appropriate curing system was DCP + Ph and in the case the 10 wt % ENR content produced a more favorable blend.
机译：通过使用内部混合器制备包含10和30重量％的ENR的乙烯乙酸乙烯酯（EVA）/环氧化的天然橡胶（ENR）共混物。使用了五种不同类型的固化系统：过氧化二枯基（DCP），硫（S），酚醛树脂（Ph），DCP + S和DCP +Ph。DCP可以与EVA和ENR交联，而S和Ph是固化剂用于ENR。由于ENR相的交联度低，DCP系统提供了最低的拉伸性能和撕裂强度。由于橡胶相具有更好的硫化作用，因此添加硫或酚醛树脂可提高机械性能。共混物的机械性能随着ENR含量的增加而降低。含有30％ENR的共混物中的橡胶粒径比含有10％ENR的共混物在机械性能中起着更重要的作用。 ENR颗粒尺寸不会影响EVA的热收缩率，并且高热收缩率不需要良好硫化的橡胶相。此外，随着所有固化体系中ENR含量的增加，共混物的热收缩率略有变化。关于机械性能和热收缩性，最合适的固化体系是DCP + Ph，在10 wt％的ENR含量的情况下，生成的混合物更为有利。

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