聚乙二醇/聚丙烯腈共混物的增容机理和蓄热储能性

Compatibilizing Mechanism and Thermal Energy Storage of Polyacrylonitrile/Polyethylene Glycol Blends

以丙烯腈(AN)和衣康酸(IA)共聚生成丙烯腈/衣康酸共聚物(P(AN-co-IA))为相容剂,用溶液共混法制备聚丙烯腈/聚乙二醇高分子固-固相变材料,用傅里叶变换红外光谱(FT-IR)、步冷曲线、差热分析(DSC)、X射线衍射(XRD)及偏光显微镜等手段对共混物进行表征,分析讨论了P(AN-co-IA)的增容机理和蓄热储能性。结果表明,P(AN-co-IA)对聚乙二醇/聚丙烯腈(PAN/PEG)共混体系具有良好的增容效果,共混材料的保温性能良好,具有较大的焓值,其相变温度和相变焓随着PEG含量的增加而提高,共混物呈现出"固-固"相变特性。在有限次的循环加热中相变温度及相变焓无明显变化,表明材料的蓄热耐久性良好。

Polyethylene glycol（PEG）/ polyacrylonitrile（PAN） shape-stabilized phase-change materials were prepared by blending acrylonitrile（AN） with copolymer P（AN- co- IA） as compatibilizer, which was copolymerized with itaconic acid（IA） and acrylonitrile/itaconic acid. First the compatibilizing mechanism of P（AN- co- IA） was analyzed and discussed, then the chemical composition, thermal insulation properties, thermal properties and crystallinity of the blend materials were investigated by FT-IR, cooling curve, differential scanning calorimetry（DSC）, XRD and polarizing microscope（POM）. The results show that the blends exhibit excellent insulation properties and have a large enthalpy; the solid- solid phase transition temperature and enthalpy increased with the increasing content of PEG; after cyclic heating for a limited cycles, the phase transition temperature and enthalpy had no significant changes which implies a good durability of heat storage of the blends.