有机小分子/膨胀石墨复合相变材料的制备及性能

Fabrication and characterization of small organic molecules/expansion graphite composite phase change materials

采用真空负载技术,将有机小分子相变材料组装到结构稳定的膨胀石墨载体中,制得结构稳定、性能良好的复合相变材料;利用X射线衍射分析仪(XRD)、差式扫描量热计(DSC)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)等技术对复合相变材料的结构、性能和负载效果进行表征.结果表明:经过负载处理后的复合相变材料在膨胀石墨纳米级狭缝限域作用和异向成核作用下,有机小分子相变单元在相转变过程中不但保持了结构稳定性,而且晶胞结构更加规整,结晶度明显提高,整个复合相变材料表现出优异的相变功能,相变过程的过冷现象也得到明显改善.

The phase change materials of small organic molecules as functional materials are loaded to vermicular slit porous expansion graphite carrier through the vacuum-load method,and the composite phase change materials with good phase change performance and stable mechanical properties are prepared.Wide-angle X-ray diffraction（XRD） measurements,differential scanning calorimeter（DSC）,field emission scanning electron microscope（FE-SEM） and transmission electron microscope（TEM） were employed respectively to investigate their structure,thermal properties and load effect.The results show that with the help of the nanoscale slit confinement effect of the expanded graphite as well as heterogeneous nucleation of composite phase change materials after loaded process in expanded graphite,small organic molecule phase change units keep the structural stability,and lattice structure become more regular and the crystallinity increased obviously.The whole of the composite phase change materials show excellent phase transformation function.The supercooling phenomenon of phase change process is also significantly improved.