乳化法制备石蜡/三元乙丙橡胶定形相变材料及其性能
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摘要
以石蜡(Paraffin)为相变材料,三元乙丙橡胶(EPDM)为支撑材料,通过乳化法将石蜡和EPDM同时乳化,再热压硫化成型得到石蜡/EPDM定形相变材料。采用扫描电子显微镜表征了定形相变材料的断面微观形貌,结果表明石蜡与EPDM的相容性良好。通过差示扫描量热仪测试了定形相变材料的焓值,表明随着石蜡含量的增加,其焓值增加。通过渗漏测试表明PCMs-30%的渗漏率可低至0.5%。通过电子万能试验机测试表明PCMs-30%的力学性能达到较为良好的状态,拉伸强度达到0.866 MPa,断裂伸长率达到480%。
Paraffin/ethylene propylene diene monomer(EPDM) shaped phase change materials were obtained by paraffin as phase change material and EPDM as supporting material. The paraffin and EPDM were simultaneously emulsified and then hot pressed subsequently vulcanized. Scanning electron microscopy(SEM) was used to characterize the cross-section morphology of the shaped phase change material. The results show that the compatibility between paraffin and EPDM is good. The enthalpy of the shaped phase change material was tested by differential scanning calorimetry(DSC), which indicates that the enthalpy value increases with the increase of paraffin content. The leakage test shows that the leak rate of PCMs-30% can be as low as 0.5%. Tests by electronic universal testing machine show that the mechanical properties of PCMs-30% reach a relatively good state, with the tensile strength of 0.866 MPa, and the elongation at break of 480%.
Paraffin/ethylene propylene diene monomer(EPDM) shaped phase change materials were obtained by paraffin as phase change material and EPDM as supporting material. The paraffin and EPDM were simultaneously emulsified and then hot pressed subsequently vulcanized. Scanning electron microscopy(SEM) was used to characterize the cross-section morphology of the shaped phase change material. The results show that the compatibility between paraffin and EPDM is good. The enthalpy of the shaped phase change material was tested by differential scanning calorimetry(DSC), which indicates that the enthalpy value increases with the increase of paraffin content. The leakage test shows that the leak rate of PCMs-30% can be as low as 0.5%. Tests by electronic universal testing machine show that the mechanical properties of PCMs-30% reach a relatively good state, with the tensile strength of 0.866 MPa, and the elongation at break of 480%.
引文
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[3]Zhang P,Xiao X,Ma Z W.A review of the composite phase change materials:fabrication,characterization,mathematical modeling and application to performance enhancement[J].Appl.Energ.,2016,165:472-510.
[4]Jiang Z,Yang W,He F,et al.Modified phase change microcapsules with calcium carbonate and graphene oxide shells for enhanced energy storage and leakage prevention[J].ACS Sustain.Chem.Eng.,2018,6:5182-5191.
[5]Zhang L,Yang W,Jiang Z,et al.Graphene oxide-modified microencapsulated phase change materials with high encapsulation capacity and enhanced leakage-prevention performance[J].Appl.Energ.,2017,197:354-363.
[6]Pandey A K,Hossain M S,Tyagi V V,et al.Novel approaches and recent developments on potential applications of phase change materials in solar energy[J].Renew.Sustain.Energ.Rev.,2018,82:281-323.
[7]Su W,Darkwa J,Kokogiannakis G.Review of solid-liquid phase change materials and their encapsulation technologies[J].Renew.Sustain.Energ.Rev.,2015,48:373-391.
[8]Zhou Y,Liu X,Sheng D,et al.Polyurethane-based solid-solid phase change materials with in situ reduced graphene oxide for light-thermal energy conversion and storage[J].Chem.Eng.J.,2018,338:117-125.
[9]Wang F,Fang X,Zhang Z.Preparation of phase change material emulsions with good stability and little supercooling by using a mixed polymeric emulsifier for thermal energy storage[J].Sol.Energy Mater.Sol.Cells,2018,176:381-390.
[10]S,ahan N,Paksoy H.Novel shapeable phase change material(PCM)composites for thermal energy storage(TES)applications[J].Sol.Energy Mater.Sol.Cells,2018,174:380-387.
[11]程金旭,张凯,杨文彬,等.三元乙丙橡胶/石蜡弹性定形相变材料的制备及性能表征[J].高分子材料科学与工程,2017,33(10):160-163.Cheng J X,Zhang K,Yang W B,et al.Preparation and characterization of EPDM/paraffin elastomeric phase change materials[J].Polymer Materials Science&Engineering,2017,33(10):160-163.
[12]Zhou Y,Liu X,Sheng D,et al.Graphene oxide/polyurethanebased solid-solid phase change materials with enhanced mechanical properties[J].Thermochim.Acta,2017,658:38-46.
[13]刘菁伟,杨文彬,田本强,等.石蜡/高密度聚乙烯/膨胀石墨导热增强型复合相变材料热导率的影响因素[J].高分子材料科学与工程,2015,31(5):83-86.Liu J W,Yang W B,Tian B Q,et al.Factors affecting thermal conductivity of paraffin/high density polyethylene/expanded graphite thermally conductive composite phase change materials[J].Polymer Materials Science&Engineering,2015,31(5):83-86.