研究了凝胶因子在醇类复合相变材料中的应用,以十八醇为储能材料,以二(3,4-二甲基苄叉)山梨醇(DMDBS)为凝胶因子制备了一种新的凝胶态复合相变材料,得到的复合相变材料具有较高的储能密度,相变材料的含量可达到94.2％.所制备的复合相变材料不易发生泄漏,DMDBS添加量为3％时,复合相变材料的凝胶解缔温度为177.4～189.8℃,远高于十八醇的熔点.DSC结果表明,复合相变材料的熔融焓变和凝固焓变分别为184.4和180.9J/g.经过100次热循环实验后,复合相变材料的相变温度没有明显变化,焓变值略有降低.通过SEM观察了复合相变材料和干凝胶的表面形态.通过添加膨胀石墨(EG)提高了复合PCM的导热性,使升温和降温时间分别缩短了54.75％和56.36％.
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