硅基复合相变材料热物性及修饰基团作用机理  

Thermophysical Properties and Modified Groups Mechanism of Silicon-based Composite Phase Change Materials

作　　者：王琛 冯妍卉 冯黛丽[1,3] 王戈 张欣欣[1,3] WANG Chen;FENG Yau-Hui;FENG Dai-Li;WANG Ge;ZHANG Xin-Xin(School of Energy and Environmental Engineering, University of Science find Technology Beijing, Beijing 100083,China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 China;Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing,Beijing 100083 China;Beijing Changfeng Xinlian Engineering Management Co. Ltd. Beijing 100039,China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]北京长峰新联工程管理有限责任公司,北京100039 [3]北京科技大学冶金工业节能减排北京市重点实验室,北京100083 [4]北京科技大学材料科学与工程学院,北京100083

出　　处：《工程热物理学报》2019年第5期1180-1187,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51606008;No.51876007;No.51436001);北京市自然科学基金(No.3192022)

摘　　要：本文以聚乙二醇为相变材料,介孔分子筛MCM-41为载体,对孔道内表面进行氨基修饰,制备了PEG/MCM-41复合相变材料.利用FT-IR、DSC以及3-Omega对材料进行了结构表征与测量.实验表明,PEG/MCM-41-OH没有发生相变,而PEG/MCM-41-NH2熔点略低于PEG,潜热随着芯材负载量增大而增加;PEG/MCM-41热导率高于基材但低于两者之和.对测量结果及规律进行机理研究,原子位置分布图、相互作用能及原子对径向分布函数表明,羟基比氨基对芯材作用力更强,束缚芯材在孔道内部运动,进而影响材料蓄热能力;振动态密度和重叠能表明,孔道内PEG原子间传热受阻,热导率下降,而MCM-41传热没有受到影响.In this paper, PEG/MCM-41 composite phase change material was prepared by using polyethylene glycol as phase change material and mesoporous molecular sieve MCM-41 as carrier to modify the inner surface of channel. The materials were characterized and measured by FT-IR, DSC and 3-Omega. The experimental results showed that there was no phase change in PEG/MCM-41-OH,while the melting point of PEG/MCM-41-NH2 was slightly lower than that of PEG. The latent heat increased with the increase of core loading, and the thermal conductivity of PEG/MCM-41 was higher than that of substrate, but lower than that of the two. Mechanism research on the measurement results and regularity of distribution map, atomic interaction energy and atom pair radial distribution functions showed that the hydroxyl had stronger force on the core material than that of amino, and then tied the core material in the internal movement of channels, thereby affecting the material storage capacity;The vibrational density of states and overlap indicated that the heat transfer between PEG atoms in the channel was blocked and the thermal conductivity decreased, while the heat transfer of MCM-41 was unaffected.

关 键 词：聚乙二醇 MCM-41 定形相变材料 分子动力学 热特性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]