- Crack healing and reclaiming of vulcanized rubber by triggering the rearrangement of inherent sulfur crosslinked networks
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CuCl2 has been shown to effectively catalyze reshuffling of the inherent sulfur crosslinked networks of vulcanized rubber. Once activated, CuCl2-based complex catalysis enables disulfide metathesis through circulated crossover reactions among disulfide and polysulfide bonds without forming radicals and ionic intermediates. By taking advantage of this mechanism, the model material of this study, vulcanized polybutadiene rubber, acquires thermal remendability as characterized by repeated restoration of mechanical properties. Moreover, it can be reprocessed like thermoplastics. The compositions and fabrication of the model material simulate those of industrial vulcanized rubber, so as to facilitate formulation optimization under the circumstances close to the actual situation for possible future practical applications. It is hoped that the results of the present preliminary exploration would provide the basis for extending the service life and developing new recycling techniques of vulcanized rubber, which is produced, used and scrapped in large quantities every day.
- Xiang,Qian,Lu,Rong,Zhang
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supporting information
p. 4315 - 4325
(2015/08/11)
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- Phosphine-catalyzed disulfide metathesis
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The reaction between disulfides and phosphines generates a reversible disulfide metathesis process. The Royal Society of Chemistry 2008.
- Caraballo, Remi,Rahm, Martin,Vongvilai, Pornrapee,Brinck, Tore,Ramstroem, Olof
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scheme or table
p. 6603 - 6605
(2009/04/20)
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- NEW SIMPLE SYNTHESIS OF UNSYMMETRICAL DISULFIDE
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Unsymmetrical disulfides from the co-photolysis of mixtures of symmetrical alkyl disulfides is reported.Rates have been obtained for 35 combinations of C2 to C10 alkyl disulfides and their isomers.An equilibrium is attained after relatively short irradiation periods in cyclohexane.
- Gupta, D.
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- Reaction of thiyl radicals. XIII. Photochemically induced exchange reactions of liquid alkyl disulfides
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The liquid phase photolysis of some 35 liquid alkyl disulfide mixtures has been studied.The corresponding unsymmetrical disulfide is the only significant product of the reaction and the system attains a photo-equilibrium state at longer exposure times.Product formation is completely eliminated by the addition of nitric oxide.Quantum yields have been redetermined for the methyl disulfide- ethyl disulfide system using four different light sources.Initial rates have been measured for each of the 35 combinations and have been shown to be a function of total molecular weight of the disulfide mixture and to be strongly influenced by steric factors.These effects are most pronounced for mixtures wherein the exchange reaction between thiyl radical and a symmetrical disulfide is important as indicated by quantum yields above unity.Combinations of isodisulfides give rise to anomalously high rates.
- Gupta, Dinesh,Knight, Arthur R.
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p. 1350 - 1354
(2007/10/02)
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- Equilibrium Studies in Photolysis of Liquid Disulphide Mixtures
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The photolysis of liquid disulphide mixtures, viz dimethyl-diethyl, dimethyl-dipropyl and diethyl-dipropyl disulphides, has been carried out and the initial rates and equilibrium constants have been determined.
- Gupta, Dinesh
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p. 328 - 330
(2007/10/02)
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