(CO)Polimerization Of Conjugated Olefin Catalyzed With Supported Titanium Catalyst

The copolymerization of butadiene and isoprene in the presence of supported titanium catalyst TiCl₄/MgCl₂-Al(i-Bu)₃ system was studied. Firstly, the influence of Hydrogen used as a molecular mass control agent on molecular mass, molecular mass distribution and rate of polymerization was investigated. The most suitable molecular mass range was confirmed based on the properties of TBIR with different molecular mass.The research results indicated that hydrogen is an effective molecular mass control agent, and that TBIR could be machining properly only with the addition of hydrogen once. When f₁⁰ value was fixed(0.2), with the ML₁₊₄^100℃ value increased, themechanical properties of raw and vulcanized TBIR, which have identical F1, wereenhanced, abrasion loss and Goodrich heat build-up increased too. The most suitable Mooney viscosity values range was 50-60. GPC analysis showed that the molecular mass distribution became narrowed when hydrogen was added more than one time. The GPC curve of TBIR with the addition of H₂ only one time is consisted of two peaks, which indicates its mechanical properties were enhanced , abrasion loss and Goodrich heat build-up decreased when compared with TBIR with the addition of H₂ more than one time. DMA analysis demonstrated that TBIR with the addition of H₂ only once has low rolling resistance and heat build-up. But the flex fatigue property of TBIR with the addition of H₂ more than one time have been improved more than 100 times, which should draw more attention.Secondly, the influence of different conversion on structure and properties of TBIR was also studied. FTIR showed that conversion had no effect on microstructure of TBIR, the composition content decreased with the increase of conversion. The properties, such as, green strength ,elongation at break, permanent set, abrasion loss...