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Citation: Li Fengfu, Jin Yingtai, Pei Fengkui, Wang Fosong, Sun Yufang. A Rare Earth Catalyst susceptible to Sterecocontrol of Isoprene Polymerization[J]. Chinese Journal of Applied Chemistry, ;1994, 11(3): 104-106. shu

A Rare Earth Catalyst susceptible to Sterecocontrol of Isoprene Polymerization

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Received Date: 16 August 1993
Available Online: 25 December 1993
Fund Project:

A new rare earth catalyst system was found.It is composed of (β-CH₃-allyl)₂LnCl₅Mg·2TMED(Ln)-R₃Al(Al)(Ln=Nd,Ce and La,TMED:N,N,N',N'-tetramethyl-ethylendiamine;R=Me-,Et-,i-Bu- and Oct-) for stereocontrol of isoprene polymerization.The catalyst was capable of carying stereoregularity of polyisoprene (PIP) in the wider range by changing the polymerization temperature,polymerization time,Al/Ln molar ratio,and solvent and giving lower molectilar weight polymers.The contents of cis-1,4-,trans-1,4,and 3,4-unit in PIPs ranged from 19% to 79%,17% to 78% and 0 to 3.5%,respectively.
- isoprene polymerization,
- π-allyl rare earth catalyst,
- stereocontrol
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