Preparation of cross-linked shape-stabil ized phase change materials
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摘要: 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。Abstract: Cross-linked shape-stabilized phase change materials (STPCM) with different gel content s were preparedwith high-density polyethylene ( HDPE) and 1∶1 blend of HDPE and low-density polyethylene (LDPE) as mat rices.The relationship between the gel content of the materials and the content of the cross-linker-dicumyl peroxide (DCP)was discussed. The stabilities of the materials were investigated by circulation experiment s. The thermal propertiesof the cross-linked STPCM were measured by DSC. The result shows that cross-linking can improve the stability ofSTPCM with the formation of the network , which will prevent the paraffin from diffusing to the out side. HDPE/LDPE blend is more suitable to encapsulate the phase change materials than HDPE. The phase change temperatureand phase change heat will not be influenced by the gel extent . The addition of porous filler , for example , diatomite , can improve the stability of the material further.
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Keywords:
- cross-link /
- shape-stabilized phase change material /
- paraffin /
- polyethylene
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