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Ch. Tenczew, D. Dobrew


Mechanism of butyl rubber vulcanization accelerated by dichloramine-T


Polimery 1981, No 8, 310



DOI: dx.doi.org/10.14314/polimery.1981.310

Summary

Infrared spectroscopy (IR) has been used for the ex­planation of accelerated rubber vulcanization mechanism of two-component systems such as Balrezen 75 alkylphenol­formaldehyde resin and dichloramine-T or Balrezen 75 re­sin and butyl rubber, Balrezen 75 resin, butyl rubber and dichloramine-T or Balrezen 75 resin modified butyl rubber and dichloramine-T. IR spectrum is unchanged by heating of resin up to 140 °C or by heating of butyl rubber — resin blend up to 160 °C. Absorption band at 1660 cm-1 attributed to quinonemethide groups appears if the systems is heated up to 80°C in the presence of small amount of dlchloramine-T; its intensity increases with the temperature rise up to 150 °C. Probably methylene — ether links and methyl and hydroxyl groups of resin react with chlorine and hydrogen chloride, evolved from dichloramine-T, and form chloro­methyl and phenol derivatives. Quinonemethide groups are formed by dehydrochlorination and dehydration of chlo­rinated derivatives. Mechanism of reaction of butyl rubber with resin In the presence of dichloramine-T is proposed.


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