Abstract
Polyisoprenes predominantly composed of cis-1,4-units are studied by the methods of NMR spectroscopy (600 MHz), GPC, and DSC. A comparative investigation of synthetic polyisoprene and natural rubbers shows that a small (up to 3–4 mol %) amount of polymer-chain disruptions, such as inverse additions of cis-1,4 units and units occurring in 3,4- and trans-1,4-configurations, has no effect on the local conformational structure of the polymer.
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