微胶囊相变材料的制备与表征

Preparation and Characterization of Microencapsulated Phase-Change Materials

以正十八烷为芯材、三聚氰胺-甲醛树脂为壁材,采用原位聚合法合成了相变储热微胶囊.利用光学显微镜、扫描电镜、差示扫描量热仪等对样品性能进行了分析和表征,并讨论了乳化剂种类和用量、助剂异氰酸酯等对微胶囊性能的影响.实验结果表明,采用阴离子与非离子混合乳化剂制备的微胶囊的各项性能均优于采用单一阴离子乳化剂所制得的微胶囊;助剂异氰酸酯的加入可大大提高微胶囊的相变潜热;所制备的相变储热微胶囊包裹完全,表面光洁,粒度均匀,平均粒径为4μm,相变潜热达176.5 J/g.

Microencapsulated phase-change materials （MPCMs） were prepared by means of in-situ polymerization, with melamine-formaldehyde as the shell and n-octadecane as the core. The properties of the products were then analyzed and characterized by using optic microscope, SEM and DSC, and the effects of the emulsifier sort, the emulsifierdosage and the isocyanate addition on the properties of the prepared microcapsules were investigated. Experimental results show that the microcapsules prepared with nonionic emulsifier and anionic emulsifier are of better performances than those prepared only with one anionic emulsifier, that the addition of isocyanate greatly improves the latent heat of MPCMs, and that the MPCMs with an average particle size of 4.0 μm and a latent heat up to 176.5J/g are of smooth morphologies, hundred-percent wrap and homogeneous size.