Preparation, Structure, and Properties of Sn-Functionalized Star-Shaped Styrene-Isoprene-Butadiene Copolymer

摘要

A new kind of Sn-functionalized star-shaped styrene-isoprene-butadiene copolymer (Sn-SIBR) was synthesized using tin-containing organo-lithium (Sn-Li) as an initiator, tetrahydrofufury ethyl ether (ETE) and sodium dodecyl benzene sulfonate (SDBS) as polar modifiers by anionic polymerization. The kinetics of terpolymerization were studied, the microstructure, the glass transition temperature (T-g), and molecular structure of Sn-SIBR were characterized by nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), and gel permeation chromatography (GPC), respectively. The polymerization rate of the monomers and NMR results show that random Sn-SIBR are being produced in the presence of ETE and SDBS. NMR results also show that the mass fraction of Total(1,2) (the sum of Bd(1,2) and Ip(1,2)) unit and Ip(3,4) unit and the T-g of copolymers increase with the increase of ETE dosage or the decrease of polymerization temperature. However, the effects of SDBS dosage on them are not obvious. Mechanical and dynamic properties indicate that Sn-SIBR has a low rolling resistance and excellent wet skid resistance as well as good mechanical properties, and could satisfy the requirements of the rubber for high performance tire tread.