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首页> 外文期刊>Journal of Applied Polymer Science >Cocontinuous morphologies in polystyrene/ethylene-vinyl acetate blends: The influence of the processing temperature
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Cocontinuous morphologies in polystyrene/ethylene-vinyl acetate blends: The influence of the processing temperature

机译：聚苯乙烯/乙烯-乙酸乙烯酯共混物中的共连续形态：加工温度的影响

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The influence of the compression-molding temperature on the range of cocontinuity in polystyrene (PS)/ethylene-vinyl acetate (EVA) copolymer blends was studied. The blends presented a broad range of cocontinuity when compression-molded at 160degreesC, and they became narrower when compression-molded at higher temperatures. A coarsening effect was observed in PS/EVA (60:40 vol %) blends upon compression molding at higher temperature with an increase in the phase size of the cocontinuous structure. Concerning PS/EVA (40:60 vol %) blends, an increase in the mixing and molding temperatures resulted in a change from a cocontinuous morphology to a droplet-matrix morphology. This effect was observed by selective extraction experiments and scanning electron microscopy. The changes in the morphology with the molding conditions affected the storage modulus. An increase in the storage modulus in blends compression-molded at 160degreesC was observed as a result of dual-phase continuity. An EVA copolymer with a higher vinyl acetate content (28 wt %) and a higher melt-flow index resulted in blends with a broader range of cocontinuity. This effect was more pronounced in blends with lower amounts of PS, that is, when EVA formed the matrix. (C) 2003 Wiley Periodicals, Inc. [References: 47]
机译：研究了压模温度对聚苯乙烯（PS）/乙烯-醋酸乙烯酯（EVA）共聚物共混物共连续性范围的影响。当在160摄氏度压缩成型时，共混物呈现出广泛的连续性，而在更高温度压缩成型时，它们变得更窄。在较高温度下压缩模塑时，在PS / EVA（60:40 vol％）共混物中观察到粗化效果，同时共连续结构的相尺寸增加。关于PS / EVA（40:60体积％）的共混物，混合和模制温度的升高导致从共连续形态变为液滴矩阵形态。通过选择性提取实验和扫描电子显微镜观察到了这种效果。成型条件下形态的变化影响储能模量。由于双相连续性，观察到在160℃下压缩模塑的共混物的储能模量增加。具有更高的乙酸乙烯酯含量（28 wt％）和更高的熔体流动指数的EVA共聚物导致共连续性范围更广。在含有少量PS的混合物中，即当EVA形成基质时，这种效果更为明显。 （C）2003 Wiley Periodicals，Inc. [参考：47]

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