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Elsevier, Polymer, 25(40), p. 7013-7017

DOI: 10.1016/s0032-3861(99)00053-1

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Observation of immobile regions in natural rubber at ambient temperature by solid-state 13 C CP/MAS NMR spectroscopy

Journal article published in 1999 by F. H. Larsen ORCID, T. Rasmussen, W. B. Pedersen, N. C. Nielsen, H. J. Jakobsen
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Employing 13C CP/MAS NMR spectroscopy, the existence of immobile regions in natural rubber (cis-1,4-polyisoprene) corresponding to a few percent of the monomer units has been detected at ambient temperature. For synthetic rubbers no immobile regions have been detected at all. Applying different physical and chemical treatments to natural rubber it is shown that mastication, γ-irradiation, and increasing the temperature, slightly above the ambient, reduce the amount of immobile regions.