4. Understanding network control by vulcanization for sulfur cross-linked natural rubber (NR)

Published Date
Chemistry, Manufacture and Applications of Natural Rubber
2014, Pages 119–134, doi:10.1533/9780857096913.1.119

• Author 

• Y. Ikeda

Abstract:

Two typical reaction mechanisms of sulfur cross-linking of cis-1,4-polyisoprene (isoprene rubber) are explained as models of vulcanization for natural rubber (NR): a benzothiazolesulfenamide (CBS)-accelerated sulfur vulcanization and a bis(dimethyldithiocarbamato)zinc(II) mediated sulfur vulcanization, the former from the viewpoint of network formation. The resultant inhomogeneity of network structure in the CBS system is revealed to be controlled by the combination and composition of the sulfur cross-linking reagents, especially those of zinc oxide with the other reagents, which was studied by small-angle neutron scattering analysis. a characteristic feature of strain-induced crystallization of the sulfur cross-linked isoprene rubber is also accounted for by the notion of network inhomogeneity. These results are useful for further enhancing the technological potential of the traditional necessary sulfur cross-linking reaction (vulcanization) of NR.

Key words

• mechanism of network inhomogeneity
• sulfur cross-linking
• isoprene rubber
• small-angle neutron scattering
• strain-induced crystallization

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