Decomposition of Di-<i>tert</i>-butyl Peroxide in Siloxane:  An Approach of the Free Radical Cross-Linking of Silicones

Baquey, Gaëlle; Moine, Laurence; Degueil-Castaing, Marie; Lartigue, J-Claude; Maillard, B.

doi:10.1021/ma0511200

Cited by 17 publications

(12 citation statements)

References 15 publications

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“…). HCRs are crosslinked with vinyl‐specific peroxides (such as dicumyl peroxide, used here), so that the vinyl groups preferentially react with any available methyl on other polymer chains, increasing the occurrence of crosslinking reactions …”

Section: Resultsmentioning

confidence: 99%

Influence of the microstructure of gums on the mechanical properties of silicone high consistency rubbers

Stricher

Picard²,

Gabrielle³

et al. 2016

Polymer International

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International audienceThis paper is devoted to the characterization and processing of high molar mass vinyl-bearing polysiloxanes in high consistency silicone rubber (HCR) formulations. The molar masses of five different polydimethylsiloxane gums, bearing vinyl groups at the ends and along their chains, were evaluated by size exclusion chromatography and rheometry. Si-29 and H-1 NMR spectroscopy allowed the precise determination of the vinyl content and of the distribution in the different polymers. Typical HCRs formulated from these gums were heat-cured to process silicone rubbermaterials that were then tested mechanically. The macromolecular properties were correlated to the final material network structure. The amount of reactive vinyl moieties, rather than their distribution along or at the end of chains, is a key parameter to tailor the material mechanical properties

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Section: Resultsmentioning

confidence: 99%

Influence of the microstructure of gums on the mechanical properties of silicone high consistency rubbers

Stricher

Picard²,

Gabrielle³

et al. 2016

Polymer International

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“…The t-butoxyl radicals appeared rapidly under the irradiation of UV light. But because of their instability, t-butoxyl radicals decomposed to form methyl radicals and acetone immediately [9,11] . When NO x existed, after a series of reactions, products of CH 3 OOH, CH 3 ONO 2 , CH 3 OONO 2 , HCHO were finally formed [4] .…”

Section: Resultsmentioning

confidence: 99%

“…DTBP is a strong source of radicals, in which the theoretical active oxygen content is 10.9%. DTBP is a compound that will decompose to generate tert-butoxyl radicals ((CH 3 ) 3 CO·) by the way of thermal decomposition [7][8][9] or photolysis [10][11][12][13] . It has been reported that the electronic structures of tert-butoxyl radicals generated by these two methods are identical [11] .…”

mentioning

confidence: 99%

Experimental investigation of incremental reactivity of di-tert-butyl peroxide

et al. 2007

CHINESE SCI BULL

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Large quantities of di-tert-butyl peroxide (DTBP) have been emitted into the troposphere due to human activities. Its role in the atmospheric photochemical reaction has not been understood. This study presents the results of the photochemical reactions of DTBP and NO x , which have been simulated in a self-made smog chamber under the temperature of (29±1)℃. Both the wall decays of ozone and NO 2 could be neglected, compared to the results in simulative experiments. The effective intensity of UV light used in the experiments was 1.28×10 −3 s −1 , which was expressed by the rate constant of NO 2 photolysis in purified air. The reaction mechanism was proposed according to our results and reports of other researchers. The maximum values of incremental reactivity (IR) in the three simulative experiments were 9.53×10 −2 , 5.23×10 −2 and 3.78×10 −2 , respectively. The incremental reactivity decreased with the increase of initial concentrations of DTBP. The IR value of DTBP obtained in this study was comparable to that of acetylene reported in our previous research.di-tert-butyl peroxide, smog chamber, photochemical reactions, photochemical smog, incremental reactivity

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“…Model studies with small siloxanes and di‐ tert ‐butyl peroxide performed by Maillard and co‐workers showed the feasibility of a second mechanism operating in parallel via carbenes . The competition between the two pathways depends on the relative amounts of peroxide used.…”

Section: Curing Systems (Cross‐linking Reactions)mentioning

confidence: 99%

Catalytic Systems for the Cross‐Linking of Organosilicon Polymers

Wang

Klein

Mejía

2017

Chemistry An Asian Journal

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Silicones and silicone rubbers are omnipresent in household and industrial products such as lubricants,c oatings, sealants,i nsulators, medicald evices, etc. This plethora of applicationsa rises from their unparalleled properties including hydrophobicity,l ow surfacee nergy,c hemical inertness, extreme temperature stability,e lasticity,a nd biocompatibility.E vent hough silicones have been known for more than five decades, their chemistry is still far from fully understood. Industrially,t he vast majority of processesf or their synthesis, transformation, andu se are based on rather well established, alas outdated technologies, which are frequently empirical and poorly investigated. Thisr eview attempts to summarize the different approaches for the synthesis of silicone rubbers by vulcanizationorc uring of silicone polymers, the catalysts used, and the corresponding reaction mechanisms. Apart from the well-known methods (radical, hydrosilylation, and metal-based condensation), novel approaches such as organo-and bio-catalysis are also addressed.

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Decomposition of Di-tert-butyl Peroxide in Siloxane: An Approach of the Free Radical Cross-Linking of Silicones

Cited by 17 publications

References 15 publications

Influence of the microstructure of gums on the mechanical properties of silicone high consistency rubbers

Influence of the microstructure of gums on the mechanical properties of silicone high consistency rubbers

Experimental investigation of incremental reactivity of di-tert-butyl peroxide

Catalytic Systems for the Cross‐Linking of Organosilicon Polymers

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