聚乙二醇/膨胀石墨相变储能复合材料的研究  

Study on polyethylene glycol/expanded graphite phase change composites for thermal storage

作　　者：康丁[1] 西鹏[1,2] 段玉情[1] 顾晓华[3] 程博闻[1] 

机构地区：[1]天津市纤维改性与功能性纤维重点实验室,天津工业大学,天津300160 [2]高分子物理与化学国家重点实验室,中国科学院化学研究院,北京100080 [3]齐齐哈尔大学,齐齐哈尔161006

出　　处：《化工新型材料》2011年第3期106-108,119,共4页New Chemical Materials

基　　金：天津市教委项目(20071212);天津市应用基础及前沿技术研究计划面上项目(2010);教育部科学技术研究重点项目(209040);黑龙江省教育厅青年学术骨干支持计划项目(1151G110)

摘　　要：利用膨胀石墨孔隙结构的高吸附特性,采用真空浸润法,将不同分子量的聚乙二醇吸附于膨胀石墨的孔隙结构中制备出了一系列聚乙二醇/膨胀石墨相变储能复合材料。通过扫描电镜(SEM)、傅里叶红外光谱仪(FT-IR)、差示扫描量热仪(DSC)、导热系数测试仪对膨胀石墨以及聚乙二醇/膨胀石墨相变储能复合材料的表观形貌、吸附机理、相转变特性与导热性能进行了分析表征。研究结果表明,膨胀石墨表面具有丰富的蠕虫状孔隙结构,其疏松多孔的结构对不同分子量的聚乙二醇具有很好的吸附性能,吸附后的石墨表面未发现聚乙二醇的残留;不同分子量的聚乙二醇/膨胀石墨相变复合材料具有类似的红外吸收光谱;实测的相变复合材料的相变温度及相变焓值比理论计算值要高,材料在相变温度下发生了固-固相转变;膨胀石墨的加入有效提高了聚乙二醇相变单元的能量存储效率。Owing to the high adsorption of expanded graphite,a series of polyethylene glycol/expanded graphite phase change composites for thermal storage were prepared using a method of vacuum infiltration by impregnating different molecular weights of polyethylene glycol into the pore structure of expanded graphite.The morphology,adsorption mechanism,phase change property and thermal conductivity of expanded graphite and polyethylene glycol/expanded graphite phase change composites were characterized and analyzed by scanning electron microscope（SEM）,Fourier transform infrared spectrometer（FT-IR）,differential scanning calorimeter（DSC） and hot constant tester（HCT）.The results showed that there were a plenty of vermiform pore structure on the surface of expanded graphite,which had good adsorption for different molecular weights of polyethylene glycol,and there were not polyethylene glycol on the surface of expanded graphite after adsorption.Different molecular weights of polyethylene glycol/expanded graphite phase change composites had the similar infrared absorption spectrum.The phase transition temperature and phase transition enthalpy of the composites obtained were higher than the theoretical value.The type of phase change for polyethylene glycol/expanded graphite phase change composites was solid-solid phase change at the phase transition temperature.Moreover,due to the introduction of expanded graphite,the energy storage efficiency of polyethylene glycol was improved.

关 键 词：相变材料 聚乙二醇 膨胀石墨 固-固相转变 

分 类 号：TB34[一般工业技术—材料科学与工程]