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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. shu

EFFECT OF HALOGEN IN(CF₃COO)₂ NdX·Et0H-R₃ AI CATALYST SYSTEM ON THE POLYMERIZATION OF CONJUGATED DIENES

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 12 April 1985
Available Online: 10 July 1985

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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EFFECT OF HALOGEN IN(CF3COO)2 NdX·Et0H-R3 AI CATALYST SYSTEM ON THE POLYMERIZATION OF CONJUGATED DIENES

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EFFECT OF HALOGEN IN(CF₃COO)₂ NdX·Et0H-R₃ AI CATALYST SYSTEM ON THE POLYMERIZATION OF CONJUGATED DIENES