Abstract: The phase change microcapsules with methyl methacrylate as the shell material and 58# paraffin as the core material were prepared by suspension polymerization. The effects of some factors on the properties of the microcapsules were studied, such as the amounts of emulsifiers and initiators, the mass ratios of the core and shell materials. Chemical compositions, surface morphologies, thermal properties and stabilities of the microcapsules were characterized by Fourier transform infrared (FT⁃IR) spectroscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. The results showed that when the mass fractions of emulsifier PVP and initiator AIBN were 7.0% and 3.9%, respectively, the microcapsules had the best morphology. When the mass ratio of the core and shell material was 3∶1, the microcapsule had a regular spherical shape with a smooth surface. At the same time, the microcapsule with the high enthalpy of phase change had a high heat storage property and stability. The quantity of heat involved in phase transition was 126.97 J/g and the content of paraffin wax as the core material was 85.4%.

Key words: Methyl methacrylate, Paraffin, Phase change microcapsules, Core/shell mass ratios, Heat storage property

摘要： 　采用悬浮聚合法制备以甲基丙烯酸甲酯为壁材，58#石蜡为芯材的相变微胶囊。考察了乳化剂和引发剂的质量分数以及芯壁比对微胶囊性能的影响，采用傅立叶红外光谱仪、场发射扫描电镜、差示扫描量热仪、热重分析等手段对微胶囊的化学结构、表观形貌、储热性能以及热稳定性等进行了表征。结果表明，乳化剂PVP和引发剂AIBN质量分数为7.0%、3.9%时，微胶囊的形貌最佳；芯壁比为3∶1制备的微胶囊呈规则球形、表面光滑、具有较高的相变焓，相变潜热为126.97 J/g，芯材石蜡质量分数为85.4%，储热性能和热稳定性好。

关键词: 甲基丙烯酸甲酯, 石蜡, 相变微胶囊, 芯壁比, 储热性能