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%.
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