分别采用高密度聚乙烯(HDPE)、高密度聚乙烯和低密度聚乙烯(LDPE)1:1的共混物作为基体材料,制备了不同凝胶率的交联定形相变材料,讨论了材料的凝胶率与交联剂用量之间的关系,并测定了材料的热性能.通过多次冷热循环实验,研究了材料的稳定性.结果表明,交联有利于改善定形相变材料的稳定性,减少石蜡的渗出.高密度聚乙烯与低密度聚乙烯的共混体系更适合作封装材料.交联程度的不同对材料的相变温度和相变热均不产生影响.多孔填料如硅藻土的添加,可以进一步减少石蜡的渗出,提高材料的稳定性.
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