Study on Microstructure and Dynamic Performance of Novel Isoprene Rubber Synthesized with Homogeneous Rare-earth Catalyst System

摘要

The homogeneous rare-earth catalytic system was used to initiate the polymerization of isoprene,and a novel IR was synthesized with high molecular weight and narrow molecular weight distribution.According to the self-developed rare-earth IR properties,a study on IR and IR/NR blend was made.Microstructure and molecular characteristics of JiHua rare-earth IR were identified by IR spectra,13C NMR and GPC,and the effect of JiHua rare-earth IR on the vulcanization characteristics and dynamic properties in IR/NR blend was investigated and compared with IR (SKI-3) synthesized with titanium catalyst system and rare-earth isoprene rubber (SKI-5) made in Russia.The results showed that JiHua rare-earth IR to be developed independently was a novel synthetic rubber with excellent comprehensive performance,and it can be used independently and partly substitute natural rubber to make tire.In the IR/NR blend,Not only vulcanization characteristics and the safety in operation for NR was greatly improved,But also dynamic properties ofvulcanizates such as dynamic cutting resistance,abrasion resistance,wet-skid resistance and aging resistance were improved to different degrees.These properties reach or surpass the level of the foreign similar products like Russia SKI-3 and Russia SKI-5.