界面聚合网状壳体聚氨酯相变微胶囊的制备与性能

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

摘要:

采用界面聚合的方法，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。研究了不同芯/壁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/壁比大于3:1时，微胶囊表面凹陷消失。当芯/壁比为3:1，TEA用量为3.5g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后的质量损失率不超过6.2%。微胶囊的熔融温度和熔融热分别为22.5 ℃和86.37 J?g-1，储热性能明显。

Abstract:

Network polyurethane shell microencapsulated phase change materials (MicroPCMs) was successfully prepared by interfacial polymerization method using isophorone diisocyanate (IPDI) and triethanolamine (TEA) as monomers. The effect of different core/wall ratio on the surface morphology and particle size distribution of microcapsules was investigated, and the effect of TEA dosage on the surface morphology, chemical structure, thermal stability and compactness of microcapsules was also investigated. The results show that the prepared microcapsules were spherical with smooth and contact surface, and the surface cave of microcapsules disappeared when the core/wall ratio was greater than 3:1. When the core/wall ratio was 3:1 and the TEA dosage was 3.5g，the MicroPCMs has good thermal stability and compactness which can withstand high temperature of 200℃, and the mass loss rate was less than 6.2%wt after drying at 120℃ for 6h. The MicroPCMs have obviously thermal energy storage performance, and the melting temperature and melting enthalpy were 22.5℃ and 86.37J?g-1 respectively.