Cross-Linking and Degradation Reactions in Synthetic Elastomers

摘要

The properties of the vulcanizates were improved in relation to resistance to deterioration, resistance to deterioration, resistance to cracking, resistance to wear, drift and resistance to heat. Detailed and complete instructions are given for applying the maximum-modulus principles of the literature to synthetic rubber stocks. A method was developed for determining the reaction products of sulfur with synthetic rubbers by working with model compounds; the indications are that the cross-linking sulfur is largely monosulfide. It was found that the cross-linking efficiency is improved by employing an amine sulfur chloride reaction product as a vulcanizing agent. The reactivity of gum and black vulcanized elastomers under stressed and unstressed conditions in the presence and absence of light was effectively studied. The reactivity under stress in light was reduced by increasing the thioether cross-linking to the optimum during vulcanization. Static and dynamic testing demonstrated that maximum modulus, synthetic and natural rubber stocks are outstandingly resistant to surface deterioration in the sun and weather. This indicated that they would be extra resistant to dynamic cracking and to intermittent, road wear. (Author)