CAJ | 학술논문

The gelatinous and macroporous phase-transfer c atalysts with multiple active centers were synthesized by means of quarterisatio n of PEG tertiary amine and chloromethylated St-DVB copolymer. They were examin ed as phase-transfer catalysts in the reaction of n-C8H17Br with s olid NaI. The experimental results showed that the reaction rate was first-orde r with respect to the concentration of n-C8H17Br. The effects of ca talyst structure on the catalytic activity were also investigated. The observed reaction rate constant (kobsd) increased as the degree of cross-linki ng of polymer decreased. Macroporous catalysts showed a higher activity (2～2.5 times) than that of microporous catalysts with the same degree of cross-linkin g of polymer, particle size and amount of supported PEG. Molecular weight of PEG also showed much influence on kobsd. As molecular weight of PEG rose properly, the catalysts showed a higher activity. The results were discussed fro m the aspect of triphase catalysis reaction mechanism.