Lee H Y, Lee S J, Cheong I W, Kim J H
Nanosphere Process & Technology Laboratory, Department of Chemical Engineering, Yonsei University, 134 Shinchon-Dong, Sudaemoon-Ku, Seoul 120-749, Korea.
J Microencapsul. 2002 Sep-Oct;19(5):559-69. doi: 10.1080/02652040210140472.
Microcapsules containing fragrant oil (Foral oil) were synthesized via the in situ polymerization method using melamine-formaldehyde (M-F) as a wall material. The encapsulation efficiency and other physical properties were analysed with varying formaldehyde/melamine (F/M) mole ratio and pH of emulsion medium. The pH of the reaction medium was varied from 5.0-6.0 and the F/M molar ratio, 2.3 - 5.5. Microcapsules containing fragrant oil were synthesized successfully and their particle sizes ranged from 12-15 micro m. Encapsulation efficiency of fragrant oil varied from 67-81%. It was found that both pH and F/M molar ratio have an effect on the separation of M-F prepolymer, consequently the morphology of the surface of the microcapsule was changed as well as encapsulation efficiency. The encapsulation mechanism, focusing on the liquid-liquid phase separation of methylolmelamines and formation of M-F precursor particle, was described to explain the surface morphology and encapsulation efficiency.
以三聚氰胺 - 甲醛（M - F）为壁材，通过原位聚合法合成了含香精油（花油）的微胶囊。在乳液介质的甲醛/三聚氰胺（F/M）摩尔比和pH值不同的情况下，对包封效率和其他物理性质进行了分析。反应介质的pH值在5.0 - 6.0之间变化，F/M摩尔比在2.3 - 5.5之间变化。成功合成了含香精油的微胶囊，其粒径范围为12 - 15微米。香精油的包封效率在67% - 81%之间变化。发现pH值和F/M摩尔比均对M - F预聚物的分离有影响，因此微胶囊表面的形态以及包封效率也发生了变化。描述了以羟甲基三聚氰胺的液 - 液相分离和M - F前体颗粒的形成为重点的包封机理，以解释表面形态和包封效率。
