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Preparation and catalytic use of silica-polymer core–shell microspheres with imidazolium-styrene copolymer shells

Paper ID Volume ID Publish Year Pages File Format Full-Text
51173 46834 2009 5 PDF Available
Title
Preparation and catalytic use of silica-polymer core–shell microspheres with imidazolium-styrene copolymer shells
Abstract

Silica-polymer core–shell microspheres with imidazolium-styrene copolymer shells were prepared by polymerization of acidic ionic liquids with styrene in the presence of 3-mercaptopropyltrimethoxysilane (MPTMS)-modified silica, in water–ethanol mixed solvent. It was found that the thickness of the copolymer shells and the amounts of ionic liquids contained in the shells depended largely on reaction parameters such as the emulsifier, and the type and mole fraction of acidic ionic liquid. Unlike the neat imidazolium-styrene copolymers, the silica-polymer core–shell microspheres were insoluble in organic solvents. Moreover, they retained the properties of the imidazolium-styrene copolymers while affording improved mechanical strength due to their core–shell structure. The core–shell microspheres can be used as efficient catalysts for acetalization of carbonyl compounds with methanol under mild reaction conditions.

Keywords
Core–shell microspheres; Acetalization; Ionic liquids; Imidazolium-styrene copolymers
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Preparation and catalytic use of silica-polymer core–shell microspheres with imidazolium-styrene copolymer shells
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 11, Issue 4, 15 December 2009, Pages 227–231
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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