月桂酸-棕榈酸/Al_2O_3复合定形相变材料的制备与热性能研究
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摘要
采用溶胶-凝胶法,以异丙醇铝(AIP)为单一铝源,无水乙醇为溶剂,聚乙烯吡咯烷酮(PVP)为聚合物模板,并添加浓盐酸作为催化剂和胶溶剂,制备均一稳定的前驱体纺丝液,再结合静电纺丝与高温煅烧技术制备了Al_2O_3纤维毛毡,用其作为支撑材料吸附月桂酸-棕榈酸(LA-PA)二元脂肪酸低共熔物制备复合定形相变材料。利用红外光谱、X射线衍射、扫描电镜和BET比表面积分析仪等手段研究样品的表观形貌与晶型结构。结果表明:经吸附后制得的LA-PA/Al_2O_3复合定形相变材料具有良好的形貌结构。通过差示扫描量热仪、热导率及自组装热性能测试仪对制备的LA-PA/Al_2O_3复合定形相变材料的储热性能及热能储存/释放性能进行了研究。结果发现其具有适宜的相变温度和较好的相变焓值,拓宽了复合定形相变材料的应用范围。
A uniform and stable precursor spinning solution was prepared by sol-gel method.Aluminum isopropoxide(AIP)as single aluminum source,anhydrous ethanol as solvent,polyvinylpyrrolidone(PVP)as polymer template,concentrated hydrochloric acid as a catalyst and peptizer,Al_2 O_3 fibrous mats was prepared combined with electrospinning technology.After calcination at 800℃,LA-PA binary fatty acid eutectic was prepared by adsorption.The morphology and crystal structure of the nanofibers were studied by FT-IR,XRD,SEM and BET surface area analyzer.The results showed that the LA-PA/Al_2 O_3 phase change materials prepared by adsorption had a good morphology.The properties of heat storage and thermal energy storage/release of the materials were investigated by DSC,thermal conductivity and self-assembly thermal performance tester.The results showed that it had a suitable phase transition temperature and better phase transition enthalpy,and broaden the application.
A uniform and stable precursor spinning solution was prepared by sol-gel method.Aluminum isopropoxide(AIP)as single aluminum source,anhydrous ethanol as solvent,polyvinylpyrrolidone(PVP)as polymer template,concentrated hydrochloric acid as a catalyst and peptizer,Al_2 O_3 fibrous mats was prepared combined with electrospinning technology.After calcination at 800℃,LA-PA binary fatty acid eutectic was prepared by adsorption.The morphology and crystal structure of the nanofibers were studied by FT-IR,XRD,SEM and BET surface area analyzer.The results showed that the LA-PA/Al_2 O_3 phase change materials prepared by adsorption had a good morphology.The properties of heat storage and thermal energy storage/release of the materials were investigated by DSC,thermal conductivity and self-assembly thermal performance tester.The results showed that it had a suitable phase transition temperature and better phase transition enthalpy,and broaden the application.
引文
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[3]Fleischer A S.Thermal energy storage using phase change materials:fundamentals and Applications[M].Germans:Springer,2015,2-3.
[4]Pasupathy A,Velraj R,Seeniraj R V.Phase change materialbased building architecture for thermal management in residential and commercial establishments[J].Renewable and Sustainable Energy Reviews,2008,12:39-64.
[5]黄雪,崔英德,尹国强,等.正癸酸-棕榈酸-硬脂酸三元脂肪酸复合相变材料的热性能[J].化工新型材料,2015,43(1):114-116.
[6]闫全英,刘莎,王随林,等.脂肪酸二元混合物储热性能的实验研究[J].化工新型材料,2017,45(8):78-80.
[7]Sari A,Karaipekli A,Alkan C.Preparation,characterization and thermal properties of lauric acid/expanded perlite as novel form-stable composite phase change material[J].Chemical Engineering Journal,2009,155(3):899-904.
[8]Zhang N,Yuan Y P,Wang X,et al.Preparation and characterization of lauric-myristic-palmitic acid ternary eutectic mixtures/expanded graphite composite phase change material for thermal energy storage[J].Chemical Engineering Journal,2013,231(9):214-219.
[9]Do C V,Nguyen T T T,Park J S.Fabrication of polyethylene glycol/polyvinylidene fluoride core/shell nanoflbers via melt electrospinning and their characteristics[J].Solar Energy Materials and Solar Cells,2012,104(9):131-139.
[10]Jeong S C,Jeon J,Seo J,et al.Performance evaluation of the microencapsulated PCM for wood-based flooring application[J].Energy Conversion and Management,2012,64(10):516-521.
[11]Zong X,Cai Y B,Sun G Y,et al.Fabrication and characterization of electrospun SiO2nanofibers absorbed with fatty acid eutectics for thermal energy storage/retrieval[J].Solar Energy Materials &Solar Cells,2015,132:183-190.
[12]常龙娇,卢立新,丘晓琳.脂肪酸定形相变材料的制备及性能表征[J].化工新型材料,2017,45(4):76-78.
[13]Latibari S,Mehrah M,Mehrah M,et al.Fabmcation and performances of microencapsulated palmitic acid with enhanced thermal Properties[J].Energy&Fuels,2015,29:1010-1018.
[14]何小芳,曹四振,张崇,等.纳米氧化铝在聚合物改性中的研究进展[J].化工新型材料,2012,40(5):7-10.
[15]Zhang P P,Lu W J,Wang Y F,et al.Fabrication of flexible and amphiphobic alumina mats by electrospinning[J].Journal of Sol-Gel Science and Technology,2016,80(3):690-696.
[16]王雁.静电纺丝法制备氧化铝纤维及其在环境领域中的应用研究[D].济南:山东大学,2015.
[17]穆建青.静电纺丝法制备直径可控的氧化硅和氧化铝[D].大连:大连理工大学,2014.
[18]贾玉娜.氧化铝纳米结构纤维的制备及性质[D].济南:山东大学,2011.
[19]Shin H U,Ramsier R D,Chase G G.Influence of calcination temperature on the surface area of submicron-sized Al2O3electrospun fibers[J].Applied Physics A-Materials Science &Processing,2016,122(3):145.
[20]Shen J Y,Li Z H,Wu Y N,et al.Dendrimer-based preparation of mesoporous alumina nanofibers by electrospinning and their application in dye adsorption[J].Chemical Engineering Journal,2015,264:48-55.