Abstract: Cross⁃linked microcapsules were prepared by suspension polymerization with polystyrene as the wall material and 58# paraffin as the core material. The effects of polymerization temperature, initiator dosage, crosslinker type and core⁃wall ratio on microcapsules were investigated. The structure, morphology, heat storage performance and thermal stability of microcapsules were characterized by FT⁃IR, SEM, DSC and TG. The experimental results show that the microcapsules prepared by the polymerization temperature of 80 ℃ and the initiator AIBN 2% have good spherical shape. The microcapsules prepared by the cross⁃linking agent DVB have less clastic debris, no agglomeration and good thermal stability. The microcapsules prepared by the core wall ratio of 3∶1 have a phase transition enthalpy of 152.2 J/g, a core material content of 82.2%, and the best heat storage performance.

Key words: Polystyrene, Paraffin, Suspension polymerization, Crosslinking, Thermal properties

摘要： 以聚苯乙烯为壁材，58#石蜡为芯材，加入交联剂采用悬浮聚合法制备了交联型微胶囊。考察了聚合温度、引发剂质量分数、交联剂种类及芯壁比对微胶囊的影响。采用FT⁃IR、SEM、DSC、TG表征了微胶囊的结构、形貌、储热性能及热稳定性能。结果表明，聚合温度80 ℃，引发剂AIBN质量分数2%时制备的微胶囊球形貌好；采用交联剂DVB制备的微胶囊碎屑少，无团聚现象，热稳定性好；以芯壁比3∶1制备的微胶囊相变焓为152.2 J/g，芯材质量分数为82.2%，储热性能最好。

关键词: 聚苯乙烯, 　石蜡, 　悬浮聚合, 　交联, 　热性能