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    Verification of Controlled Grafting of Styrene from Cellulose via Radiation-Induced RAFT Polymerization

    Year: 2007

    Journal: Macromolecules 2007, 40, 7140-7147, 20111221

    Authors: Murat Barsbay, Olgun Gu1ven, Martina H. Stenzel, Thomas P. Davis, Christopher Barner-Kowollik, and Leonie Barner

    Organizations: Faculty of Science, Department of Chemistry, Hacettepe UniVersity, 06532 Beytepe, Ankara, Turkey, and Centre for AdVanced Macromolecular Design, School of Chemical Sciences and Engineering,The UniVersity of New South Wales, Sydney, NSW 2052, Australia

    Reversible addition-fragmentation chain transfer (RAFT) polymerization was applied to radiationinduced graft polymerization of styrene from cellulose. The grafting of styrene from cellulose substrates using the chain transfer agent cumyl phenyldithioacetate was confirmed by Raman and X-ray photoelectron spectroscopy, differential scanning calorimetery, thermogravimetric analysis, scanning electron microscopy, and contact angle analysis. Grafted polystyrene chains were cleaved from the cellulose surface by acidic hydrolysis of the cellulose. The number-average molecular weight and polydispersity index of the grafted and the free (nongrafted) polystyrenes obtained under identical conditions were determined by size exclusion chromatography. Grafted and nongrafted polystyrenes have almost the same (near theoretical) molecular weight and narrow polydispersity, thus proving for the first time the control of the grafting process mediated via RAFT without any prior functionalization of the surface.