The isoprene polymerization kinetics by using TiCl₄/MgCl₂ type Ziegler-Natta catalysts (TMC) with different titanium contents were studied for better understanding the possible active-specie structures of heterogeneous Ziegler-Natta (Z-N) catalysts for conjugated diene polymerizations. The catalytic features including the catalytic activity (CA), number of active centers ([C*]/[Ti]), rate constant for polymerization (k_p), stereoregularity of these TMC catalysts were studied. The low titanium content catalyst TMC-1 (Ti = 0.09 wt.%) with more isolated mononuclear titanium species showed higher CA and yielded cis-1,4-/trans-1,4- mixed microstructure polyisoprene with low molecular weight (M_w) in the initial polymerization stage. The medium high titanium content catalyst TMC-2 (Ti = 2.38 wt.%) with more clustered mononuclear titanium species showed lower CA and yielded cis-1,4-/trans-1,4- mixed microstructure polyisoprene with high M_w in the early stage of polymerization. The high titanium content catalyst TMC-3 (Ti = 3.76 wt.%) presented lowest CA and yielded high trans-1,4- polyisoprene with higher M_w.

研究了使用钛含量不同的TiCl ₄ / MgCl ₂型齐格勒-纳塔催化剂（TMC）进行异戊二烯聚合动力学，以更好地理解非均相齐格勒-纳塔催化剂（ZN）用于共轭二烯聚合的可能的活性物种结构。研究了这些TMC催化剂的催化特性，包括催化活性（CA），活性中心数（[C *] / [Ti]），聚合速率常数（k _p），立构规整​​性。具有更多分离的单核钛物种的低钛含量催化剂TMC-1（Ti = 0.09 wt。％）显示出更高的CA，并产生了低分子量（M _w）在初始聚合阶段。具有更多群集单核钛物质的介质中的高钛含量的催化剂TMC-2（钛= 2.38重量％）显示出较低的CA和产生的顺式-1,4- /反-1,4-混合组织的聚异戊二烯具有高中号_瓦特在聚合的早期阶段。高钛含量的催化剂TMC-3（Ti = 3.76 wt。％）具有最低的CA，并产生具有较高M _w的高反式1,4-聚异戊二烯。