Preparation and Properties of Microencapsulated Phase Change Materials Containing Two-Phase Core Materials
Preparation and Properties of Microencapsulated Phase Change Materials Containing Two-Phase Core Materials
复制标题
含两相芯材的微胶囊相变材料的制备及性能
DOI：
10.1021/ie401055r
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发表时间：
2013-10-16
影响因子：
4.2
通讯作者：
Zhang, Xingxiang
中科院分区：
文献类型：
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作者：
Wang, He;Wang, Jianping P.;Zhang, Xingxiang
以聚（甲基丙烯酸甲酯-甲基丙烯酸烯丙酯）为壳层，采用两步聚合法制备了以聚吡咯（PPy）均匀分散于正十八烷（n-Oct）中的两相相变材料微胶囊。采用扫描电子显微镜（SEM）、差示扫描量热仪（DSC）、热重分析仪（TGA）对微胶囊的表面形貌、相变性能和热稳定性进行了研究。结果表明，在乳化剂苯乙烯-马来酸酐共聚物钠盐的存在下，两相核材料得到了很好的包覆。微胶囊的平均粒径约为35 μm。与未添加PPy的材料相比，MicroPCM的结晶温度有所提高。同时，异相成核焓随PPy浓度的增加而显著增加。微胶囊与4-14重量%的聚吡咯在核心材料w...
Microencapsulated phase change materials (MicroPCMs) containing two-phase core materials, in which polypyrrole (PPy) particles were homodispersed in n-octadecane (n-Oct), were synthesized by two-step polymerization technique using poly(methyl methacrylate-co-allyl methacrylate) as shell. The surface morphologies, phase change properties, and thermal stabilities of the microcapsules were investigated using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), respectively. The results show the two-phase core materials are well encapsulated in the presence of the emulsifier sodium salt of styrene–maleic anhydride copolymer. The average diameter of the microcapsules is about 35 μm. The crystallization temperature of MicroPCMs is higher than that of MicroPCMs without PPy. At the same time, the enthalpy of the heterogeneous nucleation significantly increased with increasing of the PPy concentration. Microcapsules with 4–14 wt % PPy in the core material w...