Synthetic Polyisoprene Rubber as a Mimic of Natural Rubber: …
WEBOct 13, 2023 · Furthermore, these rubbers are susceptible to attack by ozone due to the presence of double bonds in the main polymer chain, which are prone to thermal and oxidative degradation. The degradation generally occurs through chain scission and causes a drop in the mechanical properties [ 30 ].
Ozone cracking - Wikipedia
WEBTiny traces of ozone in the air will attack double bonds in rubber chains, with natural rubber, polybutadiene, styrene-butadiene rubber and nitrile rubber being most sensitive to degradation. [1] . Every repeat unit in the first three materials has a double bond, so every unit can be degraded by ozone.
The action of ozone on polymers having unconjugated and cross
WEBJan 1, 2001 · The consequence of the charge density reduction at each double bond site due to conjugation suggest that the polyene chain behaves like a benzene ring for instance towards ozone attack.
Ozone ageing: experimental methods on pristine and protected …
WEBSep 7, 2022 · Next to regular ozone attack water vapour reacts with ozone into hydroxy radicals that attack rubber in addition to pure ozone degradation similar to a degradation by ozonized water. Thus, the limit value 50% relative humidity is …
Controlled degradation and functionalization of natural …
WEBAug 9, 2021 · It has been established that the mechanism of ozone attack on olefinic compounds includes an initial addition of ozone to the carbon–carbon double bond forming an unstable adduct (molozonide) followed by a transformation to stable ozonide which subsequently will be cleaved by reducing or oxidizing …
Ozone destruction of some trans-polydienes - ScienceDirect
WEBDec 1, 1998 · A natural polymer (guttapercha) and synthetic polymers of commercial interest (trans-polyisoprene, trans-polybutadiene, trans-polypentenamer, trans-polyoctenamer, polychloroprene) have been exposed to a mixture of air and ozone in various concentrations, and at temperatures of 30 and 50°C.
WEBBeing an unsaturated hydrocarbon, rubber is prone to attack and degradation by ozone. The mechanism of ozone attack and cleavage of the double bonds on rub-ber as postulated by Criegee8 is reported to result in the formation of numerous five …
Ozone destruction of some trans-polydienes - ScienceDirect
WEBDec 1, 1998 · Using IR spectroscopy as the main technique of investigation, a series of trans-polyenes was studied as thin cast films exposed to ozone attack at concentrations of 50 and 200 pphm, at temperatures 30 and 50°C.
Protection Mechanism of Rubbers from Ozone Attack
WEBNov 11, 2018 · Ozone concentration at ground level is growing at a rate of 1% per year. Rubber articles and tires are degraded by the ozone attack. The increasing ozone concentration in air requires adequate protection of rubber goods to …
Ozone destruction of some trans-polydienes - ResearchGate
WEBDec 1, 1998 · A natural polymer (guttapercha) and synthetic polymers of commercial interest (trans-polyisoprene, trans-polybutadiene, trans-polypentenamer, trans-polyoctenamer, polychloroprene) have been...
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