为了解决聚乙二醇(PEG)相变材料的熔融泄漏问题,以PEG为相变材料,γ-缩水甘油醚氧丙基三甲氧基硅烷(KH-560)为交联剂,聚乙烯亚胺(PEI)为大分子“硬段”骨架,通过化学接枝法制备了PEI/PEG(PP)新型复合相变材料。结果表明,制备的复合相变材料具有良好的定型能力,可以防止PEG在升温熔融过程中的泄漏;最佳制备条件下得到的PP7的熔融和结晶的相变温度分别为325.0K和306.4K;熔融焓与结晶焓分别为128.8J/g和121.0J/g;该材料具有优异的相变储热性能。此外,复合相变材料在经过100次升/降温热循环测试后,相变温度和相变焓的变化均较小,显示了优异的热循环稳定性。
To address the leakage problem of polyethylene glycol (PEG),a novel composite shaped phase change material(PCM) with polyethylene glycol (PEG) as PCM,γ-glycidylethoxytrimethoxysilane (KH-560) as the crosslinking agent and polyethylene imine (PEI) as curing agent were prepared by chemical grafting.Experimental results shown that the composite PCM possessed good shaping ability,which could prevent the melting leakage of PEG during the heating stage.The phase-transition temperature of melting and crystallization of PP7 obtained under the optimum conditions were 325.0K and 306.4K,respectively.And the melting and crystallization enthalpy of PP7 were 128.8J/g and 121.0J/g,respectively.In addition,the change of phase-transition temperature and enthalpy of the material were very little after 100 times heating/cooling thermal cycle tests,indicating the excellent thermal cycle stability of the material.
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基金资助
国家自然科学基金(51971068、U20A20237、51871065);广西新能源材料结构与性能协同创新中心(2012GXNSFGA06002);广西创新驱动发展专项(AA19182014、AD17195073、AA17202030-1);广西信息材料重点实验室(201009-Z和201016K);广西重大项目(AA17202030-1);国家重点研发计划(2018YFB1502103)
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