Mary, Kurien; Dr.Kuriakose, A P(Cochin University of Science And Technology, September 7, 2002)
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Abstract:
Earlier studies5773 in our laboratory showed that when a nucleophile
is used along with disulphide or sulphenamide accelerators the
vulcanization is accelerated greatly and the reaction mechanism is generally
nucleophilic in nature. However it was observed that it also changes with
the systems under review. The present study, deals with the use of
unsubstituted amidino thiourea i.e. aminoimino methyl thiourea(AMT) V in
the vulcanization studies of different elastorners and their blends. One of the
aims of this study was to get further proof with regard to the
theory of nucleophilic reaction mechanism in such binary systems.Mixes containing thiourea are used as controls. AMT is more nucleophilic
than TU and this is clear from the fact that the fonner can condense with
isothiocynate even in the absence of alkali while TU cannot". Also the
guanidinyl group in AMT can facilitate the polarization of the C=S bond
favouring a nucleophilic reaction
Description:
Department Of Polymer Science And Rubber Technology
Cochin University Of Science And Technology