On the kinetics of ozone absorption by elastomers of various structures

Ozonolysis of Natural Rubber: A Critical Review

“…No such segments were found in natural rubber. Razumovskii et al (26) studied the relation between structure of polymer chains in rubbers and amount of ozone being added at the moment when cracks form. The ozonisation of SKI-3, SKS-30ARKP, SKD, SKKh, butyl, and natural rubber vulcanisates was correlated with their molecular structure.…”

“…Ozone-ageing of elastomers was prevented by addition of wax-coated calcium carbonate. Razumovskii et al (31) reviewed the basic reactions of ozone with saturated, unsaturated polymers, various synthetic and natural rubbers. They explained the nature of functional groups, unstable intermediates, the protection of unsaturated rubber vulcanisates against ozone, antiozonants action mechanism, the possibility of polymer modifications by ozone and the protection of articles by atmospheric ozone action.…”

“…Ozone reactions with saturated compounds are shown by contrast to all proceeds via hydride ion transfer to form an intimate ion pair [R + HO 3 -] in a solvent cage which can exothermically collapse to the observed products RO 3 H. Solvation enthalpies are calculated from the Kirkwood formula for dipole solvation and shown to lead to reasonable activation energies for ozonation of alkanes, alcohols and acetals and all of which produce the hydrotrioxides. Razumovskii et al (71) studied the kinetics of absorption by elastomers, using ozone by butyl, natural, neoprene, SKD, SKI-3 and SKS-30 ARKP rubber vulcanisates in a small glass compartment for diffusion controlled. The type of rubber had little effect on the rate, presumably due to the relatively large reactor.…”