石蜡/P(MMA-co-AA)核壳结构相变蓄能微胶囊的制备

以熔点在58~60℃的半精炼石蜡作为相变芯材,与单体、分散剂水溶液形成核壳结构分散液,室温下自由基聚合制备甲基丙烯酸甲酯-丙烯酸的共聚物(P(MMA-co-AA))为壳材的微胶囊.分别用相差显微镜、扫描电镜、差示扫描量热分析仪和傅里叶变换红外光谱仪测定了微胶囊的形貌、热性能和壳材化学结构.微胶囊的直径范围为1~5μm,其中相变芯材的含量可达70%左右,具有较高的相变潜热(99 J/g),有望应用于空调、供暖等领域.

PREPARATION OF PHASE CHANGE MATERIAL WAX/P(MMA-co-AA) CORE-SHELL MICROCAPSULES

The microcapsules containing wax encapsulated by poly(methyl methacrylate-co-acrylic acid) (P(MMA-co-AA)) with diameter in the range of 1 ~ 5μm were fabricated by radical polymerization around the wax in a dispersion system. The chemical structure, morphology and thermal behavior of the microcapsules were studied by FTIR,phase-contrast optical microscope, SEM and thermal analysis. The thermal properties of the microcapsules revealed that the content of the core material was up to about 70 %, and the microcapsules had a high latent heat (ca. 99 J/g). The dispersed microcapsules can be used as a latent functional thermal fluid to improve the heat transfer efficiency in the fields of refrigeration and air-conditioning.