Heterogenization of tin-containing polymer catalysts as a method of increasing their activity in the urethane-formation reaction

Methods for increasing the activity of polymer catalysts of urethane formation via their heterogenization in solutions have been developed. The kinetic features have been studied for model reactions carried out in the presence of catalysts containing Bu 3 SnO(O)C groups at the ends of poly(ethylene...

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Bibliographic Details
Published in:Polymer science. Series B 2009-12, Vol.51 (11-12), p.423-426
Main Authors: Levina, M. A., Ptitsyna, N. V., Khairullin, I. K., Tiger, R. P.
Format: Article
Language:eng ; rus
Subjects:
Catalysts
Chemistry
Chemistry and Materials Science
Polymer Sciences
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Summary:Methods for increasing the activity of polymer catalysts of urethane formation via their heterogenization in solutions have been developed. The kinetic features have been studied for model reactions carried out in the presence of catalysts containing Bu 3 SnO(O)C groups at the ends of poly(ethylene glycol) chains in the solvent-precipitant system, initially heterogeneous organotin catalysts based on the styrene-maleic anhydride copolymer crosslinked by divinylbenzene, and a modified silica gel prepared by the surface grafting of tributyltin acetate groups. Unlike the use of monomeric organotin catalysts of urethane formation, whose catalytic activity attains a plateau with an increase in their concentration in solutions, the use of heterogeneous catalysts results in linear dependences of the reaction rate on the concentration of catalytic centers.
ISSN:1560-0904
1555-6123
DOI:10.1134/S1560090409110013