Model study of the crosslinking of polydimethylsiloxanes by peroxides

Baquey, Gaëlle; Moine, Laurence; Babot, Odile; Degueil, Marie; Maillard, B.

doi:10.1016/j.polymer.2005.05.078

Cited by 33 publications

(59 citation statements)

References 11 publications

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“…33,34,[38][39][40][41][42][43][44][45][46] Peroxides usually serve as crosslinking or vulcanization agents. 33,34,[38][39][40][41][42][43][44][45][46] Peroxides usually serve as crosslinking or vulcanization agents.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Charpy impact strength of epoxy resin modified with vinyl‐terminated polydimethylsiloxane

Vilčáková

Kutějová

Jurča

et al. 2017

J of Applied Polymer Sci

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This article deals with enhancement of the toughness of epoxy resin (ER) based on diglycidyl ether bisfenol A by either polydimethylsiloxane (PDMS) or vinyl-terminated polydimethylsiloxane (VT-PDMS). To improve the compatibility of these two phases, dicumylperoxide (DCP) was used as a compatibilizer. It was established that only specific composition of the components can lead to enhancement of ER toughness without significant reduction of storage modulus, T g , and interphase adhesion. The highest impact strength was recorded for ER with VT-PDMS (10 wt %) and DCP (2 wt %) due to increased interfacial compatibility between two phases, which was proved by 1 H NMR and dielectric spectroscopy. Critical ductile brittle transition occurring between 10 and 15 wt % of rubber was observed by both morphological and dynamic mechanical analysis studies. V C 2017 Wiley Periodicals, Inc. J. Appl.Polym. Sci. 2018, 135, 45720.

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Section: Introductionmentioning

confidence: 99%

Enhanced Charpy impact strength of epoxy resin modified with vinyl‐terminated polydimethylsiloxane

Vilčáková

Kutějová

Jurča

et al. 2017

J of Applied Polymer Sci

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“…One of the processes for crosslinking at room‐temperature is based on dehydrocondensation which takes place between the silanol groups of the hydroxyl‐terminated PDMS and the SiH groups of the crosslinking agents generating hydrogen . Gaseous volatile products formed in the crosslinking reactions or by the decomposition of porophors play the role of blowing agents . Usually, the crosslinking and the foaming reactions progress simultaneously in this process.…”

Section: Introductionmentioning

confidence: 99%

Study of the Coalescence Mechanisms During Silicone Foaming

Jawhar

Blanc

Chaumont

et al. 2013

Macromol. Mater. Eng.

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International audienceA foam sample is assumed to be a set of bubbles embedded into a polymeric matrix with an initial gas overpressure. Silicon foams are produced by a competition between two reactions involving the hydrogenosilane functions carried by the polymer precursor: the first reaction generates gas (initiating cell formation) while the other one, hydrosilylation, well known and controlled in silicon, leads to the crosslinking of the rising foam. Thus, obtaining enhanced foam properties requires a good balance between two reactions, crosslinking and gas generation. On the other hand, the final characteristics of the foam (porosity, bulk density, etc.) largely depend on the rheology of the mix (appropriate elongational properties) as well as the added fillers. Nucleation and cell growth were carried out under optical microscopy. The experiments show that the main phenomenon controlling cell growth is bubble coalescence. Due to the surface effects and the viscoelastic properties, bubbles approach from each other and get deformed giving birth to an intermediate shape before reaching their final geometry. Many parameters have direct effect on foam properties. In fact, dissolved gas in formulae as well as the air introduced during manual mixing, reduce the skin effect and guarantee a homogeneous cell size distribution and a better foam structure. Other factors have also been studied in order to render size distribution more homogeneous and improve certain properties

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“…2,3 During the foaming process, silicone rubbers are usually crosslinked by conventional chemical methods and expanded through the decomposition of chemical blowing agent. [4][5][6][7][8][9] The crosslinking and foaming progress simultaneously in this process. The crosslinking rate of the rubber melt should be synchronous with the decomposing rate of the blowing agent.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of closed‐cell foam prepared from irradiation crosslinked silicone rubber

Liu

Zou

et al. 2009

J of Applied Polymer Sci

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Silicone rubber foam was prepared through crosslinking with electron beam irradiation and foaming by the decomposing of blowing agent azobisformamide (AC) in hot air. The crosslinking and foaming of silicone rubber was carried out separately, which was different from the conventional method of chemical crosslinking and foaming. After foaming, the silicone rubber foam was irradiated again to stabilize the foam structure and further improve its mechanical properties. The effects of irradiation dose before and after foaming, and the amount of blowing agents on the structure and properties of silicone rubber foam were studied. The experimental results show that with the increase of AC content, the average cell diameter of silicone rubber foam increases a little, the foam density decreases to a minimum value when AC content is 10 phr. With the increase of irradiation dose before foaming from 10 to 17.5 kGy, the cell nucleation density of silicone rubber foam increases, the average cell diameter decreases, and the foam density increases. With the increase of irradiation before foaming, the tensile strength, tensile modulus, and the elongation at break of the silicone rubber foam increase. Through irradiation crosslinking again after foaming, the foam density is decreased and the mechanical properties of silicone foam are further improved.

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Model study of the crosslinking of polydimethylsiloxanes by peroxides

Cited by 33 publications

References 11 publications

Enhanced Charpy impact strength of epoxy resin modified with vinyl‐terminated polydimethylsiloxane

Enhanced Charpy impact strength of epoxy resin modified with vinyl‐terminated polydimethylsiloxane

Study of the Coalescence Mechanisms During Silicone Foaming

Structure and properties of closed‐cell foam prepared from irradiation crosslinked silicone rubber

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