Abstract
Trans-1,4-polyisoprene rubber alloys(TPIR) with different butadiene incorporation catalyzed by supported titanium Ziegler. Natta catalyst within pilot plant reactor were effectively fractionated by the stepwise isothermal crystallization fractionation method. The microstructure, molecular weight (M-w) and molecular weight distribution(M-w /M-n), butadiene unit content(F-Bd), crystallization behavior and crystal form of main fractions were analyzed by C-13 NMR, GPC, DSC and XRD. The results showed that Trans-1,4-polyisoprene rubber alloys were mainly composed of 7 fractions(A-G). TPIR-05 with low butadiene incorporation was mainly composed of fraction C, D, G; TPIR-10 with high butadiene incorporation was mainly composed of fraction A, B, C, D, G. Fraction A having high butadiene unit content((F) over bar (Bd) = 22.4%, molar fraction) was gradient multi. block Trans-1,4-poly (isoprene. co. butadiene) copolymers containing Trans-1,4-polyisoprene (TPI) blocks and Trans-1,4-polybutadiene(TPB) blocks; Fractions B,