An Investigation of the Structure of Copolymers of lsobutylene and Diene Prepared by Initiation with VCI4 in the Dark and with Visible Light |
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Authors: | Ji?í Spěáv?ek Luděek Toman Miroslav Marek |
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Institution: | Institute of Macromolecular Chemistry Czechoslovak Academy of Sciences , 162 06, Prague, 6, Czechoslovakia |
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Abstract: | 1H-NMR spectra of copolymers of isobutylene and 1,3-butadiene, isoprene, and 2,3-dimethyl-1,3-butadiene were investigated in connection with the elucidation of the formation of soluble and insoluble copolymers. For copolymers soluble in heptane, benzene, and CCI4 it was found that the incorporation of diene into the polymer chain proceeds by 1,4-addition in the case of copolymerizations conducted both in the dark and with visible light using VC14 as initiator. The formation of a soluble and an insoluble copolymer is attributed to a different type of initiation, either with radical-cations of isobutylene, if soluble copolymers are formed, or with radical-cations of diene, if the arising copolymers are insoluble. |
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