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Citation: DONG Wei-Min, PANG Shu-Fen, HU Jing-Yu, YANG Ji-Hua. In situ Cyclization in the Course of Butadiene-Isoprene Copolymerization with Nd-based Catalyst[J]. Chinese Journal of Applied Chemistry, ;2000, 17(3): 272-275. shu

In situ Cyclization in the Course of Butadiene-Isoprene Copolymerization with Nd-based Catalyst

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

Received Date: 8 October 1999
Available Online: 31 January 2000
Fund Project: 国家自然科学基金资助项目(29574179) (29574179)

In the course of cis-copolymerization of butadiene(BD) with isoprene(IP) by using Nd(naph)₃-Al(C₂H₅)₃-(t-C₄H₉)Cl as catalyst in toluene, tert-butylchloride or allyl chloride was added to give a soluble, gel-free cyclized copolymer. Some parameters affecting the cyclization were investigated. The preliminary results of IR, ¹H NMR analyses confirmed the cyclization of both BD and IP units and that the IP units were cyclized in a greater extent than BD units.
- butadiene,
- isoprene,
- copolymerization,
- rare earth catalyst,
- cyclization,
- cyclopo-lymerization
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