TY - JOUR
T1 - Preparation and catalytic use of silica-polymer core-shell microspheres with imidazolium-styrene copolymer shells
AU - Yamada, Yudai
AU - Kyo, Kun
AU - Bao, Quanxi
AU - Tomida, Daisuke
AU - Nagao, Daisuke
AU - Konno, Mikio
AU - Yokoyama, Chiaki
PY - 2009/12/15
Y1 - 2009/12/15
N2 - 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.
AB - 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.
KW - Acetalization
KW - Core-shell microspheres
KW - Imidazolium-styrene copolymers
KW - Ionic liquids
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U2 - 10.1016/j.catcom.2009.09.014
DO - 10.1016/j.catcom.2009.09.014
M3 - Article
AN - SCOPUS:71549135534
VL - 11
SP - 227
EP - 231
JO - Catalysis Communications
JF - Catalysis Communications
SN - 1566-7367
IS - 4
ER -