利用微层共挤出技术对聚丙烯(PP)/乙烯-乙烯醇共聚物(EVOH)共混物进行二次加工,制备出了气体阻隔性能显著提高的PP/EVOH共混符合材料.通过电子扫描显微镜、气体渗透实验研究了微层共挤出共混物的形态结构及其对共混物阻隔性能的影响.研究结果表明,微层共挤出技术能够有效调节EVOH分散相在PP基体中的形态结构,随着层敦的增加,使其从零维球形变形为一维纤维状,进而演变成二维片状,这些形态导致128层微层共挤出共混物的气体阻隔性能较普通共混物提高了52倍.
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