载体材料表面性质对定形相变材料相变行为的影响  

Influence of surface performance of supporting materials on phase change behavior of shape-stabilized phase change materials

作　　者：王崇云[1,2] 李国玲[1,2] 王维[2] 杨华哲[2] 冯利利[2] 田文怀[1] 李星国[2] 

机构地区：[1]北京科技大学材料物理与化学系,北京100083 [2]北京大学化学与分子工程学院,北京100871

出　　处：《沈阳工业大学学报》2014年第1期39-44,共6页Journal of Shenyang University of Technology

基　　金：国家科技部973资助项目(2009CB939902);国家自然科学基金资助项目(20971009;51071003)

摘　　要：为了研究载体材料与相变材料的界面相互作用机制,以聚乙二醇(PEG)为相变材料、分子筛MCM-48和有序介孔碳CMK-5为载体材料,采用物理共混的方法制备PEG/MCM-48和PEG/CMK-5两类定形相变材料.利用氮气吸附、TEM、FT-IR、XRD和DSC等表征技术,研究定形相变材料中载体材料的表面性质对相变材料PEG的定形能力、结晶度、相变行为的影响规律.研究结果表明,CMK-5和MCM-48具有相似的有序介孔结构,但是其化学组成不同;CMK-5与PEG的界面相互作用力弱于MCM-48与PEG的界面相互作用力.因此,PEG在CMK-5中的结晶度和相变焓均大于其在MCM-48中的结晶度和相变焓.In order to investigate the interface interaction mechanism between both phase change materials （PCMs） and supporting materials, two shape-stabilized materials including PEG/MCM-48 and PEG/CMK-5 were prepared with a physical blending approach through taking polyethylene glycol （PEG） as the phase change materials as well as silica molecular sieve MCM-48 and ordered mesoporous carbon CMK-5 as the supporting materials. The influence of surface performance of supporting materials in the shape-stabilized PCMs on the stabilization ability, crystallinity and phase change behavior of PEG was investigated with various characterization techniques such as nitrogen adsorption method, transmission electron microscope （TEM）, Fourier transform infrared spectoscopy （FT-IR）, x-ray diffraction （XRD）and differential scanning calorimeter （DSC）. The results show that both CMK-5 and MCM-48 exhibit similar ordered mesoporous structure, but their chemical constitution is different. The interface interaction force between CMK-5 and PEG is weaker than that between MCM-48 and PEG. As a result, both crystallinity and phase change enthalpy of PEG in the PEG/CMK-5 composites are larger than those in the PEG/MCM-48 composites.

关 键 词：相变材料 熔化温度 相变焓 表面性质 聚乙二醇 有序介孔碳 分子筛 储热 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]