Citation:
Li Xingmin, Jin Yingtai, Li Guisheng, Shun Yufang, Ouyang Jun. EFFECT OF HALOGEN IN(CF3COO)2 NdX·Et0H-R3 AI CATALYST SYSTEM ON THE POLYMERIZATION OF CONJUGATED DIENES[J]. Chinese Journal of Applied Chemistry,
;1986, 3(2): 77-80.
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The effect of halogen atom in the (CF3COO)2NdX·EtOH-R3Al (X:Cl, Br,I;R:Et,i-Bu) catalyst system on the polymerization of butadiene or isoprene has been studied. The results indicate that the catalyst containing halogen atom with higher eletronegativity is more active. The intrinsic viscosities of polybutadiene and polyisoprene catalyzed with (CF3COO)2NdX·EtOH-Et3Al system were found in the order of Br >Cl >I while that obtained with (CF3 COO)2NdX·EtOH-i-Bu3Al system Cl >Br >I. The catalysts with different halogen lead to the microstructure change of the polymer obtained, but the active species of the catalyst system have little effect on the cis-contents of polymers.
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