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《中国化学工程学报(英文版)》 2008-01
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Low Breakage and Size-controlled Preparation of NiCl_2 Immobilized Hollow Polyurea Microcapsules

JI Hongbing 1 ,2, LI Junli 1, PEI Lixia 1 and GAO Jianrong 2 1 The Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, South China University of Technology, Guangzhou 510640, China 2 State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technol- ogy, Hangzhou 310014, China  
Polyurea microcapsules containing NiCl2 were prepared by interfacial polymerization between diisocy- anate and water with triethylamine as a catalyst in water-in-oil emulsion system. The influence of preparation con- ditions such as the dosage and feed mode of the catalyst, concentration of the encapsulated NiCl2, and concentration and structure of diisocyanates on the breakage of the microcapsules have been evaluated. The results show that breakage is strongly dependent on the rate of polymerization and stability of initial emulsion. The improved micro- capsules with low breakage have been produced under the optimum conditions. Furthermore, the obtained micro- capsules immobilizing NiCl2 as a recyclable catalyst is successfully used in benzaldehyde reduction.
【Fund】: the National Natural Science Foundation of China (No.20576045);; the Opening Foundation of Zhejiang Provin- cial Top Key Discipline;; the Program for New Century Excellent Talents in University (No.NCET-06-740).
【CateGory Index】: TQ317
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