Chromatographia (2017) 80:1287–1297 DOI 10.1007/s10337-017-3349-4 ORIGINAL Mercaptopropyl Functionalized Polymethylsilsesquioxane Microspheres Prepared by Co‑Condensation Method as Organosilica‑Based Chromatographic Packings 1 1 1 1 Jiali Li · Zhixia Huo · Lei Chen · Qian‑Hong Wan Received: 24 March 2017 / Revised: 25 June 2017 / Accepted: 30 June 2017 / Published online: 13 July 2017 © Springer-Verlag GmbH Germany 2017 Abstract Mercaptopropyl functionalized polymethyl- Introduction silsesquioxane microspheres have been prepared by a two- step acid/base catalyzed hydrolysis and co-condensation Polysilsesquioxanes, also referred to as organosilicas, are of methyltrimethoxysilane (MTMS) and mercaptopropyl- an interesting class of materials with structure charac- trimethoxysilane (MpTMS) precursors. The mercaptopro- terized by random networks of crosslinked silsesquiox- pyl loading of the microspheres is controlled by regulating ane units with formula (RSiO ) where R is the organic 1.5 n, the ratio of MpTMS to MTMS in the reaction feedstock. substituent. Compared with inorganic silica (SiO ), these A pronounced decrease in surface area, pore volume, and hybrid materials produced by hydrolysis and condensa- pore size with increasing mercaptopropyl loading was tion of organic functional trialkoxysilane monomers exhibit observed and a transition in pore structure from mesopores remarkably enhanced chemical, electrical, and mechanical to micropores/nearly nonporous occurred at mole fractions properties, and, therefore,
Chromatographia – Springer Journals
Published: Jul 13, 2017
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