Abstract
Application of differential scanning calorimetry to cis-1,4-polyisoprene reveals structural transitions, the temperatures of which are the same as the temperature transitions observed previously by IR spectroscopy and by a diffusion method. Heating of the elastomer at constant temperature provides a means of formulating its matrix structure in each case, which differs in the predominant contribution of some thermodynamically stable ordered formations of macrochain fragments of specific conformation. The multiplicity of observed structural transitions is determined by the existence of a set of chain conformers.
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