Isothermal crystallization fractionation and fraction characterization of trans-1,4-poly(isoprene-co-butadiene)

Based on the different crystallizability of polymer chain with different chain structures, poly (isoprene-co-butadiene) (TBIR) copolymers were fractionated into eight fractions by isothermal crystallization fractionation. The TBIR-15 is mainly composed by various multi-block copolymers with different length TPI blocks (nIp = 6∼24). The TBIR-40 is mainly composed by random copolymers, among which 69.7 wt% are elastomers, 17.1 wt% consist a few TPI and TPB blocks that both showing weak crystalline behavior.330