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

Sahyoun, Jihane; Bounor‐Legaré, Véronique; Ferry, Laurent; Sonnier, Rodolphe; Bonhommé, Anne; Cassagnau, Philippe

doi:10.1016/j.polymdegradstab.2015.02.017

Cited by 15 publications

(10 citation statements)

References 44 publications

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“…However, the ignition of the SiP based composite occurred earlier than the PA6. This tendency was also observed in thermogravimetric analysis under air and was attributed to the catalytic effect of phosphorus compounds and was more pronounced with the SiP based nanocomposites [9]. This decrease of the time to ignition was also observed for ethylene vinyl acetate EVA/SiP based composites [10].…”

Section: Introductionsupporting

confidence: 63%

Synthesis of a new organophosphorous alkoxysilane precursor and its effect on the thermal and fire behavior of a PA66/PA6 copolymer

Sahyoun

Bounor‐Legaré

Ferry

et al. 2015

European Polymer Journal

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Authors would like to thank Christine LUCAS for help in solid state NMR experiments, C2P2 (Chemistry, Catalysis, Polymer & Processes), UMR 5265 - University of Lyon 1.International audienceA new silicophosphorylated filler was generated in situ in a molten PA66 copolymer during extrusion process with the aim to improve the fire behavior of the matrix. The filler was obtained in one step via hydrolysis-condensation reactions of SiDOPO precursor (DOPO, 9,10-dihydro-9-oxa-10-phosphaphenanthrene). The synthesis of the precursor is reported and characterized by NMR. A Si-29 NMR study of SiDOPO hydrolysis-condensation reactions in N-methylacetamide (NMA) solvent was also conducted. Thermal stability of Cop-PA/SiDOPO composite and the major degradation products were studied by thermogravimetric analysis coupled with Infrared spectrometry (TGA/FTIR). The Pyrolysis Combustion Flow Calorimeter (PCFC) and cone calorimeter were used to investigate the fire behavior of the composite. Results show that the nanocomposite exhibits a little earlier ignition but with a decrease around 33% of the peak of heat release rate (PHRR). The presence at low concentration of silicon (0.65 wt.%) and phosphorus (0.75 wt.%) promotes the formation of an expanded char layer that acts as a barrier. A reduction of about 18% in effective heat of combustion (EHC) values suggests an additional flame inhibition effect of phosphorus in the gas phase

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Section: Introductionsupporting

confidence: 63%

Synthesis of a new organophosphorous alkoxysilane precursor and its effect on the thermal and fire behavior of a PA66/PA6 copolymer

Sahyoun

Bounor‐Legaré

Ferry

et al. 2015

European Polymer Journal

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“…Just as organophosphorus flame retardants, the flame‐retardant action of PACP may be expected in gas phase due to flame inhibition of fuel, and/or in the condensed phase due to involving of the macromolecules in charring process . It was well known that the morphology and architecture of the char were very important for the condensed phase activity.…”

Section: Resultsmentioning

confidence: 99%

“…By this way, it can enhance mechanical and other properties of flame‐retardant PET . The bi‐phase flame‐retardant activity of phosphorous compounds showed the high flame‐retardant efficiency . The flame‐retardant activity in the condensed phase creates a charred layer by dehydration and further cross‐linking reactions.…”

Section: Introductionmentioning

confidence: 99%

The flame‐retardant properties and mechanisms of poly(ethylene terephthalate)/hexakis (para‐allyloxyphenoxy) cyclotriphosphazene systems

Pan

Zeng

et al. 2015

J of Applied Polymer Sci

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Para‐allyl ether phenol derivative of cyclophosphazene (PACP) was prepared and used as a filler to modify the flame‐retardant properties of poly(ethylene terephthalate) (PET) by melting‐blending. The mechanism of flame‐retardant was discussed and the influences of flame‐retardant contents to the mechanical properties were studied. The results revealed that the incorporation of only 5 phpp PACP (0.37 wt % phosphorus containing) into PET matrix can distinctly increase the flame retardancy of PET/PACP composition, and it has a little effect on the mechanical properties of PET. The high flame‐retardant performance of PET/PACP composite was attributed to the combination of condensed‐phase flame retardant and gas‐phase flame retardant. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42711.

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“…Polyamides were flame retarded with two organophosphorus silica generated in situ from alkoxysilanes called SiP and SiDOPO. The preparation methods of SiP and SiDOPO as well as the char acterization of the composites can be found elsewhere [26,27].…”

Section: Methodsmentioning

confidence: 99%

Studying the thermo-oxidative stability of chars using pyrolysis-combustion flow calorimetry

Sonnier

Viretto

Otazaghine

et al. 2016

Polymer Degradation and Stability

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International audienceA method to estimate the thermo-oxidative stability of chars is proposed using pyrolysis-combustion flow calorimetry. The temperature of char degradation is measured for different oxygen fractions (from 0.01 to 0.4, i.e. from 0 to 40%) into the pyrolyzer. Then the thermo-oxidative stability versus the oxygen fraction is modelled using a simple phenomenological equation. Two parameters have been calculated: the first one predicts the temperature of char degradation in “pure” oxygen and the second one corresponds to the sensitivity of the char degradation temperature to the oxygen fraction. These two parameters allow comparing the chars obtained from different materials after various pyrolysis procedures. Rough relationships between these two parameters and the elemental composition of char are identified. Phosphorus allows improving the thermo-oxidative stability of chars as expected but its effect is nonlinear. Lignocellulosic materials lead to chars with low thermal stability even when the phosphorus content is high. Finally, the obtained results show that the char elemental composition is not the only parameter influencing its thermo-oxidative stability

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

Cited by 15 publications

References 44 publications

Synthesis of a new organophosphorous alkoxysilane precursor and its effect on the thermal and fire behavior of a PA66/PA6 copolymer

Synthesis of a new organophosphorous alkoxysilane precursor and its effect on the thermal and fire behavior of a PA66/PA6 copolymer

The flame‐retardant properties and mechanisms of poly(ethylene terephthalate)/hexakis (para‐allyloxyphenoxy) cyclotriphosphazene systems

Studying the thermo-oxidative stability of chars using pyrolysis-combustion flow calorimetry

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