Solid-State 13C NMR Characterization of Irradiation-Cross-Linked Natural Rubber

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Abstract:

Solid-state 13C NMR was used to characterize the structure changes produced in gamma irradiation in natural rubber. The structure of the irradiated natural rubber was found to be heterogeneous, consisting of a mobile phase and a semi-rigid phase. Cis-trans chain isomerization was detected in the mobile phase of the gamma-irradiated samples. The CP/MAS spectra of the more rigid phase contained resonances due to quaternary carbons arising from cross-links and vinyl end groups caused by main chain scission. The calculated values of β and G(X) agreed with earlier published results. Peroxide-cured natural rubber of an equivalent amount of network density showed a higher amount of trans structure than did the gamma-irradiated natural rubber.

Keywords: Analysis for cross-linking; Molecular structure; NMR

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702874448814

Affiliations: 1: Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106; present address: The General Electric Company, Mt. Vernon, IN 47620 2: Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

Publication date: March 1, 1987

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