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以苯乙烯(St)和二乙烯基苯(DVB)为壁材聚合单体,偶氮二异丁腈(AIBN)为引发剂,羟丙基纤维素(HPC)和碳酸钙(Ca CO3)为复合分散剂,用种子微悬浮聚合法制备交联聚苯乙烯(PS)包覆硬脂酸丁酯微胶囊。用扫描电子显微镜(SEM)、差示扫描热量仪(DSC)、粒度分析仪和热重分析仪(TG)表征了微胶囊的形貌和性能,考察了聚合方法、交联剂和分散剂对微胶囊形貌结构和性能的影响。结果表明,种子微悬浮聚合法制备的微胶囊呈粒径分布均匀、规整的球形结构,与常规悬浮聚合法制备的微胶囊相比,相变潜热提高了41.6%,包覆率提高15.1%;随着DVB用量的增加,壁材的交联度增大,微胶囊密封性和热稳定性提高;采用复合分散剂且m(HPC)∶m(CaCO_3)=2.2∶1时,微胶囊相变潜热提高了26.8%。
Using styrene (St) and divinylbenzene (DVB) as the wall monomer, AIBN as initiator, HPC and CaCO 3 as The composite dispersant was prepared by micro-suspension polymerization of crosslinked polystyrene (PS) coated butyl stearate microcapsules. The morphology and properties of microcapsules were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), particle size analyzer and thermogravimetric analyzer (TG). The effects of polymerization method, cross-linking agent and dispersant on Effect of microcapsule morphology and structure. The results showed that the microcapsules prepared by seed micro - suspension polymerization showed uniform particle size distribution and regular spherical structure. Compared with the microcapsules prepared by conventional suspension polymerization, the latent heat of transformation increased by 41.6% and the coverage rate increased by 15.1%. With the increase of the dosage of DVB, the degree of cross-linking of the wall material increased, the encapsulation and thermal stability of the microcapsules increased. When the composite dispersant was used and the molar ratio of Ca (HPC): m (CaCO 3) Latent heat increased by 26.8%.