Abstract

In the present paper we discuss the crosslinking of polybutadiene bearing alkoxy silane functions (PBU nSi), where n is the number of silanes per chain ( n = 1.2, 2, 2.4). Crosslinking was carried out at different temperatures, with and without a catalyst. The best experimental conditions correspond to 80°C, under moisture with dibutyl tin dilaurate as the catalyst in the ratio of [DBTL]/[Si] = 5 × 10 −3. The reaction was followed by the measure of swelling ( Q) in toluene and mechanical parameters (storage modulus ( E′), E′ at rubbery plateau and tan δ). The low rate of modification, essentially at chain extremities, leads to the molar mass per crosslinked unit ( Mc ) being practically constant and thus to a weak increase of T g whatever the n value. Only a drop of damping efficiency is observed during the crosslinking process.

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