以聚脲为囊壁薄荷素油微胶囊的制备及表征  

Fabrication and Characterization of Microcapsulated Dementholized Peppermint Oil with Polyurea Shell

作　　者：张姚[1] 赵迪[1] 焦鑫[1] 叶凯[1] 鲁希华[1,2] 邱高[2] 

机构地区：[1]东华大学化学化工与生物工程学院,上海201620 [2]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620

出　　处：《高分子学报》2016年第1期46-52,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号51473032);上海科委国际科技合作项目(项目号13520720100)资助

摘　　要：采用界面聚合法,以薄荷素油为芯材,以异佛尔酮二异氰酸酯为壁材单体,在催化剂四甲基乙二胺作用下和水反应形成聚脲外壳,制备出了薄荷素油微胶囊.通过扫描电镜、激光粒度分析仪、傅里叶红外光谱仪及热重分析仪分别对香精微胶囊的表面形貌、粒径分布、单体反应情况和热稳定性进行了分析表征.通过紫外可见分光光度计对香精微胶囊包覆率进行了测定.并分析了均质化速率和微胶囊平均粒径的关系以及不同乳化剂种类和芯壁比条件下微胶囊的形貌特征.结果表明,微胶囊平均粒径随均质化速率的增大而减小,下降到1μm左右时趋于平稳,当乳化剂采用聚乙烯醇且芯壁比为4∶1时,微胶囊形貌最佳,为规整球形.最终测得微胶囊芯材包覆率为84.09 wt%,粉末状微胶囊样品含油率为72.64 wt%,并且微胶囊芯材具有良好的热稳定性.Dementholized peppermint oil（ DPO） was successfully encapsulated by polyurea shell which was synthesized through interfacial polymerization of isophorone diisocyanate as monomer with water using N,N,N＇,N＇-tetramethylethylenediamine as catalyst. Morphology,particle size distribution,reaction degree of the monomer and thermal stability of DPO microcapsules were characterized by scanning electron microscope（ SEM）,laser particle size analyzis,Fourier transform infrared spectroscopy,and thermal gravity analysis. The encapsulation efficiency of DPO microcapsules was determined by ultraviolet（ UV） spectrophotometer. In addition,the effect of the homogenization rate on average particle size was analyzed,and the morphologies of DPO microcapsules prepared with different kinds of emulsifiers and with different ratios of core / shell materials were also explored respectively. The results showed that the average particle size decreased with the increase of homogenization rate and tended to be stable as it decreased to 1 μm. SEM images showed that the optimal morphology of microcapsules is neat sphere by using polyvinyl alcohol as emulsifier with 4∶ 1 ratio of core / shell materials. The UV measurement results showed that the encapsulation efficiency of the core materials can reach up to 84. 09 wt%. And the powder microcapsules prepared by freeze-drying contain 72. 64 wt% of dementholized peppermint oil. Encapsulated DPO inside the microcapsules demonstrated much better thermal stability than pure DPO.

关 键 词：聚脲 薄荷素油 微胶囊 异佛尔酮二异氰酸酯 四甲基乙二胺 

分 类 号：O631[理学—高分子化学]