氧化石墨烯/聚乙二醇复合相变材料的研究  

Study on graphene oxide/PEG shape-stabilized composite phase change materials

作　　者：马鹏常[1] MA Pengchang(Zhongshan Polytechnic,Zhongshan 528404,China)

机构地区：[1]中山职业技术学院,广东中山528404

出　　处：《湖北大学学报（自然科学版）》2019年第3期287-292,共6页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金(61804159);广东省教育科研重大专项(2017GKTSCX080);中山市社会公益科技重大专项(2018B1020)资助

摘　　要：采用化学法直接获得亲水氧化石墨烯(GO),并利用超声处理和微波辅助的方法制备氧化石墨烯定型的聚乙二醇(PEG)基复合相变材料(PCMs).氧化石墨烯作为支撑材料加入到聚乙二醇基体材料中来提高其热学性质,同时起到对聚乙二醇定型的效果.在超声处理和微波的辅助下,氧化石墨烯片层被扩展开且整个合成过程简便高效.少量(质量分数约4%)的氧化石墨烯便可使相变材料具有优异的定型效果.差示扫描量热法结果显示这种定型相变材料的焓值为174. 5 J/g,是聚乙二醇相变焓值的95. 6%.热重分析结果表明该相变材料在温度低于350℃时热稳定性突出.同时,本研究还探讨了该复合材料的光热转换性能,结果显示氧化石墨烯的加入显著提高了复合材料的热学性能.Hydrophilic Graphene oxide( GO) was prepared directly with a chemical process, then polyethylene glycol( PEG) based shape-stabilized composite phase change materials( PCMs) were successfully synthesized by a sonication and a facile and effective physical blending method with the assistance of microwave. GO,as a supporting material,was added in the PEG matrix to improve thermal properties of PCMs and keep their stabilized shape during phase change process. With the assistance of sonication and microwave,the interlayer spacing of GO sheets was expanded and the entire blending process was simple and effective. A small content( about 4%) of GO can make the composite absorb energy efficiently without leakage during their phase change because of the hydrogen bonding and capillary force between the GO layers and PEG molecular chain. The DSC results showed that the composites had a good heat storage capacity of 174. 5 J/g,which was 95. 6% of the phase change enthalpy of pure PEG,and the DTA results revealed that as-obtained products had an excellent thermal stability under the temperature less than 350 ℃. The photothermal energy conversion of the composites was explored and the results indicated that the thermal properties of the composites were enhanced obviously by an addition of adequate GO.

关 键 词：定型相变材料 氧化石墨烯 聚乙二醇 热学性能 

分 类 号：O613[理学—无机化学] O631[理学—化学]