不同壁材辣素微胶囊的化学法制备与性质研究 I:表面结构分析

在乳液体系中,选择蜜胺甲醛、尿醛、聚脲、聚氨基甲酸酯四种壁材,以原位聚合法和界面聚合法制备了辣素同系物———N-香草基壬酰胺微胶囊.电镜与红外光谱显示了微胶囊的形成.以X射线衍射、光电子能谱和比表面分析探索了微胶囊的表面性质,根据微胶囊的外观和囊壁结晶状态,囊壁可分为有规则结晶状态的无孔膜和无明显结晶峰的有孔膜两类,其表面碳原子的化学位移类似碳单质sp3杂化态的构型,是导致各类壁材出现不同程度结晶区的重要原因.微胶囊颗粒间无明显孔分布、符合紧密堆积方式和Langumire解析式.

Preparation and Research of Microencapsules Containing Capsaicine with Different Walls by Chemical Methods(I): Analyse of Surface Structure

Microencapsules containing N-pelargonylvanillylamide,the homolog of capsaicine,were prepared in emulsion by in situ and interfacial polymerization methods.The different kinds of wall such as urea-formaldehyde,melamine-formaldehyde,polyurea and polycarbamino easter were selected.The results of SEM and IR showed that microencapsules had existed.The analyse methods including XRD,XPS and surface absorption were used to probe the surface structure of microencapsules.The results showed that the wall of microencapsules could be divided into two categories,one is porosity with low crystallinity,the other is imperforation with high crystallinity.The configuration of carbon atoms of the walls were similar to sp~(3) hybridization state,it could be seen the important reason that induce the crystal and amorphous mixation in polymolecular film.Depending on the absorption curve,the microencapsules were considerde to be in form of cumulating tightly,and there were no obvious hole distribution in it.The model were fit for Langumire formula.