Poly(N-isopropylacrylamide)-grafted silica as a support of platinum colloids: Preparation method, characterization, and catalytic properties in hydrogenation

• Published in: Journal of applied polymer science Vol. 77; no. 12; pp. 2678 - 2684
• Main Authors: Suzuki, Kazuya, Yumura, Takeshi, Mizuguchi, Masaaki, Tanaka, Yuko, Chen, Chun-Wei, Akashi, Mitsuru
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 19.09.2000; Wiley
• Subjects: Applied sciences; Catalysis; Catalysts: preparations and properties; Chemistry; Exact sciences and technology; General and physical chemistry; graft polymerization; Organic polymers; Physicochemistry of polymers; platinum colloids; poly(N-isopropylacrylamide); Properties and characterization; silica; Special properties (catalyst, reagent or carrier); Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Surface reaction; Graft copolymers; Specific surface area; Experimental study; Hydrogenation; Silica; Acrylamide derivative polymer; Supported catalyst; Allylic compound; Heterogeneous polymerization; Heterogeneous catalysis; Free radical polymerization; Platinum; Preparation; Porosity; Catalyst activity; Colloid particle; Catalyst support
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/1097-4628(20000919)77:12<2678::AID-APP150>3.0.CO;2-9

We investigated the composition, properties, and utility of a novel hybrid material of poly(N‐isopropylacrylamide)‐grafted silica. The modified silica was prepared in two steps: (1) grafting silane layers of active precursors, such as initiator, transfer agent or comonomer onto the silica surface by solution deposition and (2) radical polymerization of N‐isopropylacrylamide (NIPAAm) on the grafted silane layers. Thermogravimetric analysis (TGA), elemental analysis (EA), FTIR spectroscopy, and TEM were used to characterize the layer composition, structure, and chemistry, respectively. Well‐dispersed platinum colloids have been prepared on the PNIPAAm‐grafted silica via the reduction of PtCl 2−6 by ethanol. The immobilized Pt colloids were found to be active and stable heterogeneous catalysts for the hydrogenation of ally alcohol in ethanol. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2678–2684, 2000