低熔点金属与聚合物复合不仅可以产生高性能的导电和导热复合材料,还为聚合物多相多组分体系的研究提供了新的模型.为系统认识低熔点金属液体/聚合物熔体复合体系在外场作用下的结构变化,首先通过光学显微镜研究了拉伸条件下液态Sn/熔融聚乙烯复合体系中Sn液滴的纤维化现象;然后,测量了不同拉伸程度下Sn/聚乙烯复合体系中Sn粒子的尺寸,并研究了拉伸程度对Sn粒子尺寸的影响;最后揭示了Sn液滴纤维化的机制.结果表明:在液态Sn/熔融聚乙烯复合体系的拉伸过程中,Sn液滴的直径越大,则越先开始纤维化;纤维状Sn粒子的直径由复合体系的拉伸程度决定,而其长度则由Sn液滴的体积决定.所得结论可为高性能金属/聚合物复合材料的制备提供理论指导.
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