二十烷@二氧化硅复合相变储能材料的热化学性能  

Thermal Properties of N-Eicosane@ Silicon Dioxide Compositesas Phase Change Materials for Heat Eenrgy Storage

作　　者：李毅妮[1] 王韶旭[1] 张施慧 

机构地区：[1]大连交通大学环境与化学工程学院,辽宁大连116028 [2]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2014年第A01期161-165,共5页Journal of Dalian Jiaotong University

基　　金：辽宁省教育厅高等学校优秀人才支持计划资助项目(LJQ2013051)

摘　　要：利用溶胶-凝胶法制备了正二十烷@二氧化硅复合相变储能材料.其中二十烷为相变主体材料,二氧化硅为基体材料,它能提供较强的结构强度,防止二十烷在熔化时发生泄漏现象.实验表明,在该复合材料中,二十烷不发生泄露的最大质量百分比可达到73%.使用红外(IR)、热重(TG)及差示扫描量热(DSC)等多种方法对该复合材料的结构与热性质进行研究.结果表明二十烷的亚甲基与二氧化硅的硅醇基之间有很强界面相互作用,可以改变二十烷的物理性质.该复合材料显示出与纯二十烷不同的相变特性,其储热能力高于二十烷,同时复合材料的热导率和二十烷相比有所增加.N-eicosane/SiO2 composites were synthesized by sol-gel method. In this new material, the n-eico- sane served as the latent heat storage and silicon dioxide acted as the supporting to provide structural strength and prevente the leakage of the melted n-eicosane. Results indicate that the maximum weight percentage for n- eicosane in the PCM composites without any seepage in melted state is 73%. Various techniques were carried out to characterize the structural and thermal properties of the composites. The result of Fourier transformation infrared spectroscope （FTIR） shows that there are strong interface interactions between the - CH2 group of the n-eicosane and Si - OH in SiO2, which change the physical properties of the n-eicosane. The differential scan- ning calorimetry （DSC） analysis results indicate that the composites exhibit different phase change characteris- tics from the pure n-eicosane. The thermal storage capabilities of the composites are superior to or close to the n-eicosane. The thermal conductivity measurement result presentes an enhanced thermal conductivity of the composites.

关 键 词：正二十烷相变材料 复合材料 热性质 热能储存 

分 类 号：TB34[一般工业技术—材料科学与工程]