Search Results - "Gac, P."

Modelling pure polyamide 6 hydrolysis: Influence of water content in the amorphous phase by Deshoulles, Q., Le Gall, M., Dreanno, C., Arhant, M., Priour, D., Le Gac, P-Y.

“…•Hydrolysis of polyamide 6 (PA6) in water without oxygen is a slow process•Water content absorbed by polyamide increases significantly during hydrolysis•Chain…”
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Physical ageing of epoxy in a wet environment: Coupling between plasticization and physical ageing by Le Guen-Geffroy, A., Le Gac, P.-Y., Habert, B., Davies, P.

“…This paper shows how physical ageing and plasticization processes are coupled in an amine-based epoxy. The study combines several ageing conditions including…”
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Embrittlement induced by oxidation in polyethylene: Role of initial bimodality by Laot, R., Le Gac, P.-Y., Le Gall, M., Broudin, M., Ovalle, C., Laiarinandrasana, L.

“…•Oxidation changes the chain length distribution from bimodal to unimodal.•Oxidation leads to the embrittlement of the polymer.•An embrittlement criterion can…”
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Description and modeling of polyurethane hydrolysis used as thermal insulation in oil offshore conditions by Le Gac, P.Y., Choqueuse, D., Melot, D.

“…Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep…”
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Influence of Sea Water Aging on the Mechanical Behaviour of Acrylic Matrix Composites by Davies, P., Le Gac, P-Y., Le Gall, M.

“…A new matrix resin was recently introduced for composite materials, based on acrylic resin chemistry allowing standard room temperature infusion techniques to…”
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Testing of nitrile rubber joints for a deep submergence vehicle by Davies, P., Gac, P-Y Le, Ciausu, V., Gallois, H.

“…This paper describes an experimental study of the long term sealing performance of nitrile rubber joints on a manned deep ocean submersible operating down to…”
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Hydrolytic degradation of biodegradable poly(butylene adipate-co-terephthalate) (PBAT) - Towards an understanding of microplastics fragmentation by Deshoulles, Q., Gall, M. Le, Benali, S., Raquez, J-M., Dreanno, C., Arhant, M., Priour, D., Cerantola, S., Stoclet, G., Gac, P.Y. Le

“…•Hydrolysis of PBAT occurs mainly on the ester situated between the terephthalate and adipate groups.•Activation energy of the PBAT hydrolysis is…”
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Durability of polydicyclopentadiene under high temperature, high pressure and seawater (offshore oil production conditions) by Le Gac, P.Y., Choqueuse, D., Paris, M., Recher, G., Zimmer, C., Melot, D.

“…In the offshore industry polymer coatings are widely used to ensure thermal insulation of steel pipes, and to avoid over-cooling of the hot oil inside. Because…”
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Fatigue resistance of natural rubber in seawater with comparison to air by Narynbek Ulu, K., Huneau, B., Le Gac, P.-Y., Verron, E.

“…•Fatigue life and crack propagation tests are performed.•Fatigue damage is analyzed by scanning electron microscopy.•Fatigue behavior is the same as in air…”
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Evaluation of Long Term Behaviour of Polymers for Offshore Oil and Gas Applications by Le Gac, P.-Y., Davies, P., Choqueuse, D.

“…Polymers and composites are very attractive for underwater applications, but it is essential to evaluate their long term behaviour in sea water if structural…”
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Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure by Le Gac, P.Y., Le Saux, V., Paris, M., Marco, Y.

“…Polymers are widely used in marine environments due to their excellent properties and good weathering resistance. Despite this extensive use, their long term…”
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Limits in the validity of Arrhenius predictions for field ageing of a silica filled polychloroprene in a marine environment by Le Saux, V., Le Gac, P.Y., Marco, Y., Calloch, S.

“…Accelerated ageing in natural sea water at different temperatures from 20 °C to 80 °C was performed on a silica filled polychloroprene rubber. Degradation when…”
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Moisture sorption in polyamide 6.6: Experimental investigation and comparison to four physical-based models by Broudin, M., Le Saux, V., Le Gac, P.Y., Champy, C., Robert, G., Charrier, P., Marco, Y.

“…Water sorption in polyamide 6.6 has been characterized for a wide range of temperature (25°C to 80°C) and various water activities using a Dynamic Vapor…”
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The relationship between environmental exposure to cadmium and lead and blood selenium concentration in randomly selected population of children inhabiting industrial regions of Silesian Voivodship (Poland) by Gać, P, Pawlas, N, Poręba, R, Poręba, M, Pawlas, K

“…This study aimed at determining the relationship between environmental exposure to lead (Pb) and cadmium (Cd) and blood selenium (Se) concentration in randomly…”
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Chemical coupling between oxidation and hydrolysis in polyamide 6 - A key aspect in the understanding of microplastic formation by Deshoulles, Q., Le Gall, M., Dreanno, C., Arhant, M., Priour, D., Le Gac, P.Y.

“…•Chain scission is much faster in water in presence of oxygen compared to water without oxygen.•An increase in humidity level of air leads to an increase in…”
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Origin of embrittlement in Polyamide 6 induced by chemical degradations: mechanisms and governing factors by Deshoulles, Q., Le Gall, M., Dreanno, C., Arhant, M., Stoclet, G., Priour, D., Le Gac, P.Y.

“…•Decrease in strain at break during polyamide ageing is due to decrease in tie molecule concentration•Both molar mass and amorphous layer thickness can be used…”
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Water diffusivity in PA66: Experimental characterization and modeling based on free volume theory by Broudin, M., Le Gac, P.Y., Le Saux, V., Champy, C., Robert, G., Charrier, P., Marco, Y.

“…[Display omitted] •The paper presents original water absorption results for polyamide 6.6.•An important influence of water activity on water diffusion kinetic…”
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Allotransplant of Microencapsulated Parathyroid Tissue in Severe Postsurgical Hypoparathyroidism: A Case Report by Cabané, P, Gac, P, Amat, J, Pineda, P, Rossi, R, Caviedes, R, Caviedes, P

“…Abstract The last therapeutic alternative in severe postsurgical hypoparathyroidism is allotransplantation of microencapsulated parathyroid cells. With this…”
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Polychloroprene behaviour in a marine environment: Role of silica fillers by Tchalla, S.T., Le Gac, P.Y., Maurin, R., Créac'hcadec, R.

“…Polychloroprene rubbers are widely used in marine structures and often filled with silica in order to increase mechanical properties. The presence of silica…”
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Analysis of the moisture effect on the mechanical behaviour of an adhesively bonded joint under proportional multi-axial loads by Arnaud, N., Créac'hcadec, R., Cognard, J.Y., Davies, P., Le Gac, P.Y.

“…The objective of the study is to identify the 3D behaviour of an adhesive in an assembly, and to take into account the effect of ageing in a marine…”
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