聚乙二醇单甲醚固-固相变材料的合成与性能测试

Synthesis and Properties Test of Solid-solid Phase Change Materials

为得到相变温度较低,相变焓较高的相变材料,以聚乙二醇单甲醚(MPEG)为软段,4,4′-二苯基甲烷二异氰酸酯(MDI)、新戊二醇(NPG)为硬段,合成聚氨酯固-固相变储能材料.利用差示扫描量热仪(DSC)、热重分析仪(TGA)、红外光谱(IR)、偏光显微镜(POM)分析了材料的形态结构和相变行为.结果表明:所制备的相变材料具有良好的固-固相变储热性能,相变焓达到146.6 J/g,相变温度为43.92℃,且具有很好的热稳定性.相过程的变实质是相变材料中的软段MPEG在结晶态与为非晶态之间相互转化的过程.

To obtain phase change materials with low temperature and high enthalpy, the polyure- thane solid-solid phase change materials was prepared with methoxypolyethylene glycol （MPEG） as soft segment, 4,4＇-diphenylmethane diisocyanate （MDI） and neopentyl glycol（NPG） as hard seg- ments. DSC, TG, IR and POM techniques were used to analyze the structure and properties of the prepared phase change materials. Results showed that the phase change materials had good thermal stability and the phase transition temperature was at 43.92 ℃. The transition enthalpy was up to 146.6 J/g. The heat storage mechanism is the transition process of MPEG from crystalline state to a- morphous.