热处理对相变材料纳米胶囊性能的影响  

Effect of Heat Treatment on Properties of Nanoencapsulated Phase Change Materials

作　　者：樊耀峰[1] 张兴祥[1] 王学晨[1] 牛建津[1] 蔡利海[1] 

机构地区：[1]天津工业大学功能纤维研究所,天津300160

出　　处：《材料工程》2004年第4期11-15,19,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50073015)

摘　　要：以环己烷和正十八烷为囊心,用原位聚合法合成了三聚氰胺-甲醛树脂为囊壁的相变材料纳米胶囊,在不同温度下对胶囊热处理不同的时间,采用SEM,DSC,TG-DTA和IR等测试手段对胶囊的性能进行了研究。结果表明,热处理对胶囊的表观形貌、相变性能和耐热性能有很大的影响,热处理过程中环己烷扩散出囊壁,在胶囊内形成预留膨胀空间,使胶囊的耐热温度增高。当热处理温度为160～180℃,热处理时间在30～60min时,得到的胶囊破裂较少,胶囊的相变热为150J/g,耐热温度可以达到215℃左右。Nanoencapsulated phase change material (PCM) was prepared by in-situ polymerization with melamine-formaldehyde resin (M-F) shell. The core material was a mixture of n-octadecane and cyclohexane. The properties of the capsules were systematically studied through scanning electronic microscopy (SEM), differential scanning calorimeter (DSC), thermal gravimeter (TG) and infrared spectrometer (IR), etc. After they were heat-treated at different temperatures for 30-60 min. The results show that the average diameter of the capsule is approximately 0. 75 micron being in the range of nanocapsule. Heat treatment has significant effect on the morphology, phase change property and thermal stability of nanocapsule. A free expansion space inside the capsule is formed after the cyclohexane in the core diffuses out of the shell by heat treatment, and the free expansion space will increase the thermal stability of nanocapsule. The nanocapsule with best thermal stability and enthalpy can be obtained by heat treatment at a temperature from 160℃ to 180℃ for 30 minutes to 60 minutes. The enthalpy of nanocapsule is about 150J/g, and the thermal stability is approximately 215℃.

关 键 词：纳米胶囊 相变材料 热处理 表观形貌 相变性能 耐热性能 相变热 三聚氰胺 甲醛树脂 

分 类 号：TQ323.1[化学工程—合成树脂塑料工业] TB383[一般工业技术—材料科学与工程]