Influence of radiation-crosslinking on flame retarded polymer materials—How crosslinking disrupts the barrier effect

Sonnier, Rodolphe; Caro-Bretelle, A. S.; Dumazert, Loïc; Longerey, Marc; Otazaghine, Belkacem

doi:10.1016/j.radphyschem.2014.08.012

Cited by 12 publications

(13 citation statements)

References 33 publications

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“…An infrared camera (Optris) was placed in an inclined position above the specimen in order to record the temperatures field of the upper surface of the sample. The inclination of the infrared camera was of few degrees relative to the perpendicular position, which limits the error on measurements [39]. The infrared camera is calibrated to measure temperatures in the range 125-900°C.…”

Section: Iii324 Condensed Phase Study/barrier Effectmentioning

confidence: 99%

Influence of organophosphorous silica precursor on the thermal and fire behaviour of a PA66/PA6 copolymer

Sahyoun

Bounor‐Legaré

Ferry

et al. 2015

Polymer Degradation and Stability

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International audienceAn organophosphorus silica filler was generated in situ the molten PA66 copolymer (Cop-PA) during extrusion process without adding solvents. Nanocomposites synthesis is based on hydrolysis-condensation reactions of diethylphosphatoethyltriethoxysilane precursor (SiP). The thermal stability of Cop-PA/ SiP nanocomposites and the major degradation products were studied by thermogravimetric analysis (TGA) and TGA coupled with Infrared spectrometry (TGA/FTIR). The Pyrolysis Combustion Flow Calorimeter (PCFC) and cone calorimeter were used to investigate the fire behaviour of the nanocomposites. Results showed a decrease by more than 50% of the peak of heat release rate (PHRR) and the formation of an expanded char layer with the addition of only 0.91wt% of silicon and 0.96wt% of phosphorus by this original route of fillers dispersion

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Section: Iii324 Condensed Phase Study/barrier Effectmentioning

confidence: 99%

Influence of organophosphorous silica precursor on the thermal and fire behaviour of a PA66/PA6 copolymer

Sahyoun

Bounor‐Legaré

Ferry

et al. 2015

Polymer Degradation and Stability

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“…Recently, a study has pointed out the influence of heat distortion induced by irradiation on the flame retardancy of a flame‐retarded PP/PA6 (PP =80 wt% and PA6 = 20 wt%) blend . The blend containing 1 phr of crosslinking agent (triaryl isocyanate) was submitted to various radiation doses (up to 100 kGy) and tested using cone calorimetry.…”

Section: Impact Of Ageing On Flame Retardancymentioning

confidence: 99%

“…Heat distortion of a PP/PA6 blend during cone calorimeter test (left) and change in pHRR for three blends with radiation dose (right; irradiance of 50 kW m −2 . (Graph drawn from data in Sonnier et al )…”

Section: Impact Of Ageing On Flame Retardancymentioning

confidence: 99%

Effects of ageing on the fire behaviour of flame-retarded polymers: a review

2014

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International audienceThe influence of environmental ageing on the reaction to fire of flame-retarded polymers is reviewed. Six types of stimuli have been identified as the most relevant parameters inducing fire behaviour modification: temperature, moisture, UV radiation, ionizing radiation, chemical solvent and physical stress. This review provides a state of the art and current comprehension of the effects of ageing on flame retardancy of polymers. Various physical and chemical phenomena lead to ageing and deterioration (or sometimes improvement) of the flame retardancy of polymers: release of additives (not only flame retardants) through thermal migration, solubilization, abrasion, etc., chemical degradation of the flame-retardant system, and chemical or physical modification of the polymer structure (chain scission, crosslinking, diffusion of water, etc.). Obviously, ageing effects strongly depend on the material and the ageing scenario considered. Solutions to maintain flame-retardant efficiency in aggressive conditions are also presented

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“…γ-Rays are applied in the field of flame retardation of polymers, too. The recent study of Sonnier et al [43] demonstrates for blend PP/PA-6/crosslinking agent that, depending on the type of retardation, the best flame-retarded blend before irradiation can become the worst one after irradiation at a higher dose. In this case, a dose up to 100 kGy was used.…”

Section: Radiation Effects In Materialsmentioning

confidence: 99%

Radiation Effects in Polyamides

Porubská¹

2016

Radiation Effects in Materials

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Polyamides PAs are largely used either as engineering materials in virgin form or as composites and a component of polymer blends. Various processes have been used to modify some properties of polymers to improve their utility. For this purpose, radiation technologies present clear, one-step procedures and offer improvement to the performance of PA materials. Irradiation by accelerated electron beams, γ-rays, and accelerated protons is applied on PAs, particularly PA-, as well as PA composites. Variations of important characteristics, such as chemical structure, supermolecular structure, mechanical properties, thermal resistance, water absorption, and other parameters, are analyzed involving results obtained by other authors. The application of irradiation on incompatible polymer blends involving PA is presented as well. The selection of radiation treatment of PAs has to be considered to obtain optimal results.

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Influence of radiation-crosslinking on flame retarded polymer materials—How crosslinking disrupts the barrier effect

Cited by 12 publications

References 33 publications

Influence of organophosphorous silica precursor on the thermal and fire behaviour of a PA66/PA6 copolymer

Influence of organophosphorous silica precursor on the thermal and fire behaviour of a PA66/PA6 copolymer

Effects of ageing on the fire behaviour of flame-retarded polymers: a review

Radiation Effects in Polyamides

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