Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry
ISSN: 0975-413X
Abstract
Cationic ring-opening copolymerization of propylene oxide with tetrahydrofuran by acid exchanged montmorillonite clay
Author(s): Belbekiri Habiba, Meghabar Rachid* and Belbachir Mo hammedThe copolymerization of propylene oxide (PO) with t etrahydrofuran (THF) catalyzed by Maghnite-H + (Mag-H + ) was investigated. Mag-H + , a nontoxic catalyst for cationic polymerization o f vinylic and heterocyclic monomers, is a montmorillonite silicate sheet clay. This catalys t was prepared through a straight forward proton ex change process. It was found that the copolymerization in bulk is initiated by Mag-H + at room temperature. Various techniques, including H 1 NMR, IR, and Ubbelohde viscometer were used to eluc idate structural characteristics of the resulting copolymers. The effects of the amount of Mag-H + and propylene oxide were studied. The copolymeriza tion yield increased as the proportions of catalyst and propylene oxide were increased. Finally, a mechanis m for the reaction was proposed.
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Citations : 25868
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