Journal
EUROPEAN POLYMER JOURNAL
Volume 49, Issue 10, Pages 3078-3088Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2013.05.032
Keywords
Living anionic surface initiated polymerization (LASIP); Grafting from; Polyisoprene; Silica nanoparticles; Nanocomposites
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Living anionic surface initiated polymerization (LASIP) of isoprene from initiator modified silica nano- and glass particles is conducted. In order to prepare polyisoprene-silica composites, the surfaces of the particles are modified with three coupling agents, each bearing a diphenyl ethylene (DPE) moiety with different alkyl-spacer lengths, thus separating the DPE moiety in different distance from the particles' surfaces. Surface initiated polymerization reactions from modified particle surfaces are performed by using n-BuLi to activate the DPE units and benzene as solvent via LASIP. Grafted polyisoprene-silica composites are analyzed via TGA, resulting in grafting densities of the produced inorganic-polymer composites in the range from 0.10 to 0.24 chains/nm(2). Analysis via GPC reveals polydispersity values ranging from 1.1 to 1.7. The final microstructure of the grafted polyisoprene is investigated via NMR, revealing 15% 1,2, 35% cis-1,4 and 50% trans-1,4, irrespective of the spacer length of the DPE bearing coupling agent. (C) 2013 Elsevier Ltd. All rights reserved.
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