Kinetics of the growth of cracks on polyisoprene vulcanizates in ozone

Synthesis of polybutadiene-silica nanoparticles via differential microemulsion polymerization and their hydrogenated nanoparticles by diimide reduction

“…It can be concluded that the C]C bond in polymer backbone of NR and NR/PB-SiO 2 are sensitive to ozone resulting in rubber degradation and the reduction of mechanical and thermal properties. Moreover, ozone also attacks polymers containing hydrogen atom in which the reaction between ozone and the CeH bond is much slower than that between ozone and the C]C bond [36]. The cracking density of NR/HPB-SiO 2 at 80:20 was lower than that of unfilled NR (Fig.…”

Improving thermal and ozone stability of skim natural rubber by diimide reduction

“…The reaction between ozone and the C]C bond is assumed to follow a bimolecular law, where each C]C bond functions as an independent kinetic unit [26][27][28]. Moreover, ozonisation is not limited to unsaturated polymers.…”

Polymeric Materials for Membrane Contactor Devices Applied to Water Treatment by Ozonation

“…Ozone is an unstable molecule and it is generated in situ by electrical discharges, converting part of gaseous oxygen from dry air or liquid oxygen 5 . Although many authors proposed a variety of ozonolysis mechanism in the last century 6 , the ozonolysis mechanism proposed by Criegee [7][8][9][10] is the one currently used, where polymers with double carbon-carbon bonds in the main chain can easily react with ozone. In this mechanism, an ozone molecule attacks a double bond of carbons in a dipolar cycloaddition process forming an unstable primary ozonide (molozonide).…”