Abstract
2-Ethyl-, 2-n-propyl-, 2-isopropyl-, and 2-n-butylbutadienes were synthesized and polymerized by using stereospecific catalysts for isoprene polymerization, i.e., (a) TiCl4—Al(C2H5)3—BF32C6H5OH, (b) n-butyllthium/heptane, (c) VOCl3—Al(C2H5)3, and (d) n-butyllithlum/ethyl ether. It was found that poly(2-ethyl-, polyl(2-n-propy-, and poly(2-isopropylbutadiene)s prepared by the catalyst (a) were high-molecular-weight types having a rubber-like elasticity and consisted of predominantly cis-1,4 structure. The cis-1,4-unit content in the polymers prepared by the catalyst (a) decreased in the following sequencemethyl-≅ethyl->n-propyl->isopropyl->>n-butyl-in accordance with the decreasing order of the activity of this catalyst for these monomers. The polymers having 80—90% of cis-1,4 unit were obtained by the catalyst (b) except for n-butylbutadiene. On the other hand, no stereospecific polymers of trans-1,4 or 3,4 structure were obtained by the catalysts (c) and (d).
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Ohno, R., Tanaka, Y. & Kawakami, M. Synthesis and Characterization of 2-Alkylbutadiene Polymers. II. Stereospecific Polymerization of 2-Ethyl-, 2-n-Propyl-, 2-Isopropyl-, and 2-n-Butylbutadienes. Polym J 4, 56–60 (1973). https://doi.org/10.1295/polymj.4.56
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DOI: https://doi.org/10.1295/polymj.4.56
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