一种MGPM/Opal固-固相变储能材料的相变及结晶行为

Behaviors of a MGPM/Opal Solid-Solid Phase-Change Storage Material

采用含有相变单元的单体缩聚法合成了侧链含有聚乙二醇单甲醚(MPEG)的新型固-固相变储能复合材料(相变共聚物缩写名称为(MGPM)/蛋白石(opal)),通过广角X射线衍射(WAXD)、差热扫描量热仪(DSC)和热台偏光显微镜(POM)、热重(TG)等测试手段对其结晶结构、结晶行为、结晶形态和热稳定性进行了研究,结果表明,天然纳米材料蛋白石的加入改善了MPEG的结晶行为,提高了聚合物的结晶速率。蛋白石的添加量为0.7%时可以最大程度提高聚合物的结晶度,相变焓值最高达到109.07 kJ/g,比纯MPEG的熔融焓值提高了10.578 J/g,结晶焓值提高了8 J/g,热稳定性良好。

A solid-solid phase change energy storage composite material with polyethylene glycol single methyl ether（MPEG） chain structure,which chould be abbreviated as MGPM/opal,was synthesized by the way of monomer polycondensation with phase change.Wide-angle X-ray diffraction（WAXD）,differential thermal scanning calorimeter（DSC） and hot stage polarizing microscope（POM）,thermogravimetry（TG） and other testing methods were performed to investigate the crystal structure,crystallization behaviors,crystalline morphology and thermal stability of the composite materials.The results indicate that the addition of natural nano-phase materials opal improves the crystallization behavior and increases the crystallization speed of MPEG.When the mass fraction of opal is 0.7%,the crystallinity of the copolymer is the highest,when the phase change enthalpy comes to 109.07 kJ/g.Compared to the pure MPEG,the melting enthalpy and the crystallization enthalpy of the copolymer increase by 10.578 J/g and 8 J/g,respectively.The thermal stability of the copolymer is good,and it increases with the increase of opal.