石蜡－密胺树脂微胶囊相变材料制备与表征

研究中采用了正十八烷石蜡相变材料（ PCM）芯材，密胺树脂作为囊壁材料，用原位聚合法制备成微胶囊材料。通过改变芯材和囊壁材料的质量比，探讨了微胶囊制备过程中O／W乳化液的相稳定性，并采用SEM， FT－IR，粒度分析仪和DSC对微胶囊的形态及性能进行表征。结果表明芯材增大O／W乳化液的相稳定性下降，微胶囊数量平均粒径和体积平均粒径均减小，当芯材和囊壁材料的质量比（ Core／Shell）为1．5：1时，微胶囊表面光滑致密，平均粒径为3．6μm，相变焓为98．6 MJ／mg。

Preparation of Melamine-formaldehyde Containing Phase Change Material

The octadecane of phase change materials （ PCM） was encapsulated in several micro-diameter shell which prevented leakage of the material during its liquid phase.Microencapsulated PCM （ PM） was prepared with the different weight ratio of core material to wall material, by in-situ polymerization methods using melamine-formaldehyde as shell material.Phase stability for O/W emulsion of PCM and PVA ap.（ PE ） was evaluated by Turbiscan Lab.The capsule formation was identified by using FT-IR.Physical properties of microcapsules including diameter, particle distribution and morphology were investigated.