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以相对分子质量分别为4000、6000、10000、20000的聚乙二醇(PEG)为相变主材料,吸附性良好的膨胀石墨(EG)或活性炭颗粒(ACG)为支撑材料,采用物理吸附加熔融共混的方法制备出不同分子量的PEG定型相变材料,使用差示扫描量热仪(DSC)对不同分子量的定型相变材料的相变温度、相变焓进行测试与表征,探究不同分子量的对定型相变材料储热性能的影响。结果表明,支撑材料并未影响PEG的相变行为,PEG仍具有良好的结晶性能,PEG定型相变材料的结晶温度、熔融温度随相对分子质量的增加而增大,而其结晶焓、熔融焓不完全随着相对分子质量的增大而增大,而是在PEG相对分子质量为10000时达到顶峰,然后有所下降。
Using PEG (PEG) with relative molecular mass of 4000, 6000, 10000 and 20000 as the phase change host material and with good adsorbability of EG or ACG as support material, Melt-blending method was used to prepare PEG phase-change materials with different molecular weights. The phase transition temperature and phase-transition enthalpy of phase-change materials with different molecular weights were measured and characterized by differential scanning calorimetry (DSC) Of the phase change material heat storage properties. The results show that the support material does not affect the phase transition behavior of PEG, PEG still has good crystallization performance. The crystallization temperature and melting temperature of PEG phase change material increase with the increase of relative molecular mass, while the enthalpy of crystallization, enthalpy of fusion Not completely with the relative molecular mass increases, but at a PEG relative molecular mass of 10000 peaked, and then declined.