界面聚合网状壳体聚氨酯相变微胶囊的制备与性能

Preparation and Properties of Network Polyurethane Shell Microencapsulated Phase Change Materials via an Interfacial Polymerization

采用界面聚合法,以异佛尔酮二异氰酸酯（IPDI）与三官能度的三乙醇胺（TEA）为反应单体,制备了具有高致密性网状交联结构的相变微胶囊。考察了不同芯/壁质量比对微胶囊表面形貌和粒径分布的影响,以及TEA用量对微胶囊表面形貌、化学结构、热稳定性和致密性的影响。结果表明,所制备微胶囊呈球形分布,表面完整致密,当芯/壁质量比≥2.73∶1.00时,微胶囊表面凹陷消失。当芯/壁质量比为2.73∶1.00,TEA用量为3.5 g时,所制备微胶囊壳体致密无破损,具有优良的热稳定性和致密性,可耐200℃以上高温,经120℃烘干6 h后,微胶囊的质量损失率为5.52%。微胶囊的熔融温度（T_m）和熔融热焓（△H_m）分别为22.5℃和86.37J/g,储热性能较好。

Network polyurethane shell microencapsulated phase change materials（Micro PCMs） were successfully prepared by an interfacial polymerization method using isophorone diisocyanate（IPDI） and triethanolamine（TEA） as monomers. The effect of core/shell mass ratio on the surface morphology and particle size distribution of Micro PCMs was investigated. In addition, TEA dosage was varied to investigate its effect on the surface morphology, chemical structure, thermal stability and compactness of Micro PCMs. The results showed that the prepared microcapsules were spherical with smooth and contact surface, and the surface cave of microcapsules disappeared when the core/shell mass ratio was greater than 2.73∶1.00. When the core/shell mass ratio was 2.73∶1.00, the TEA dosage was 3.5 g, the prepared Micro PCMs had good thermal stability and compactness, which could withstand high temperature of 200 ℃, and the mass loss was 5.52% after drying at 120 ℃ for 6 h. The Micro PCMs had an obviously thermal energy storage performance, and the melting temperature（Tm） and melting enthalpy（△Hm） were 22.5 ℃ and 86.37 J/g, respectively.