Abstract - Synthesis of Polyisoprene-Grafted Silicas by Free Radical Photopolymerisation of Isoprene Initiated from Silica Surface


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Synthesis of Polyisoprene-Grafted Silicas by Free Radical Photopolymerisation of Isoprene Initiated from Silica Surface Daniel Derouet and Chi Nhan Ha Thuc Synthetic silicas are used increasingly in tyre tread compounds. However, their use as fillers for hydrophobic rubbers (synthetic polydienes, natural rubber) is questionable unless a silanecoupling agent is introduced to bind the silica to the rubbers and to prevent it from interfering with the reaction mechanism of the sulphur-cure system. In order to improve the interphase strengths between silica and hydrophobic rubber, as well as to suppress the effects of silanol groups on sulphur-cured systems, polyisoprene-grafted silicas were synthesised. The principle of the synthesis was based on the “living” radical photopolymerisation initiated from the silica surface. For that, a two-step procedure was adopted. First, silica particles were functionalised with N,N-diethyldithiocarbamate iniferter groups, by using a SN2 substitution of chlorine atoms previously bound on silica surface. Following this, photopolymerisation of isoprene was carried out from the N,N-diethyldithiocarbamate iniferter groups and the polymerisation progress was simultaneously followed by HPLC and NMR. Functionalised silicas and polyisoprene-grafted silicas were characterised by solid-state ¹³C and ²⁹Si CP/MAS NMR. back
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