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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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网络结构对多层聚乙烯共混物界面扩散行为的影响
DOI: 10.3724/SP.J.1105.2012.12037, PP. 1007-1014
Keywords: 聚乙烯共混物,网络结构,界面扩散,流变学
Abstract:
通过溶液法制备超高分子量聚乙烯(UHMWPE)/乙烯-己烯共聚物(PEH)共混物,采用动态流变学方法研究了UHMWPE/PEH共混物多层膜在熔点以上的界面扩散行为,结合Double-Reptation理论计算得到了UHMWPE/PEH共混物多层膜的自扩散系数.研究表明UHMWPE在浓度c=1.0wt%以上可以在PEH基体中形成网络结构.UHMWPE/PEH共混物多层膜界面扩散不符合严格的菲克扩散定律,扩散系数具有时间依赖性.扩散曲线显示扩散过程在到达平台值之前分为2个区域,区域I接近于菲克扩散;然而由于引入UHMWPE,区域II扩散显著偏离菲克扩散行为,特别是当UHMWPE在PEH基体中形成网络结构以后,偏离菲克扩散行为更加显著.
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