Polymerization Kinetics Behavior of Butadiene / Isoprene / Styrene With Tin-Containing Organolithium As Initiator

A novel tin-functionalized integrated rubber of butadiene-isoprene-styrene tri-copolymer (SIBR) was prepared with self-made tin-containing organolithium (SnLi) as initiator, cyclohexane as solvent and tetrahydrofuran (THF) as polar modifier. The effects of THF/SnLi (mole ratio) and initiation temperature on polymerization kinetics were investigated. The results showed that polymerization rate was linear with relative monomer concentration. The reaction rate constant of each monomer and total reaction increased gradually with increasing THF/SnLi and temperature. The apparent chain propagation activation energies of Bd, Ip and St were 68.486, 87.984, 76.351 kJ/mol, respectively. The chain growth frequency factors of Bd, Ip and St were respectively 2.86×10¹⁰, 1.47×10¹³ and 3.40×10¹¹min^-1 when THF/SnLi was 30.