Flame retardancy mechanism of poly(butylene terephthalate)/aluminum diethylphosphinate composites with an epoxy-functional polysiloxane

Han, Xiao; Zhao, Jianqing; Liu, Shumei; Yuan, Yan

doi:10.1039/c4ra00515e

Cited by 27 publications

(21 citation statements)

References 34 publications

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“…The improved fire resistance of PBT/AlPi/EPM composites was attributed to the synergistic flame-retarding effect between AlPi and EPM. 15,17 In addition, all PBT/AlPi/EPM composites exhibit higher tensile strength than the PBT/AlPi composite and neat PBT. The PBT/AlPi/EPM composite with 0.6 wt% EPM shows a tensile strength, elongation at break, flexural modulus, and Izod notched impact strength of 54.9 MPa, 13.1%, 3.17 GPa, and 49.0 J m À1 , respectively.…”

Section: Resultsmentioning

confidence: 97%

Performance improvement of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate composites by epoxy-functional polysiloxane

Han

Zhao

Liu

et al. 2014

High Performance Polymers

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An epoxy-functional polysiloxane (EPM) was employed for improving the performance of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate (PBT/AlPi) composites. The effect was investigated by UL-94 test, limiting oxygen index, mechanical test, torque rheometer measurement, differential scanning calorimetry, dynamic mechanical analysis, and heat distortion temperature. An obvious increase in torque evolution of the PBT/AlPi composite during processing was associated with chain-extending, branching, and cross-linking reaction by the combination of EPM. The addition of 0.6 wt% EPM remarkably enhanced not only the mechanical properties but also the flame retardancy and heat resistance of the PBT/AlPi composite. A high-performance PBT/AlPi composite was developed by virtue of EPM.

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Section: Resultsmentioning

confidence: 97%

Performance improvement of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate composites by epoxy-functional polysiloxane

Han

Zhao

Liu

et al. 2014

High Performance Polymers

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“…The peaks at 1100 and 874 cm −1 are belonging to P═O and P─O group, respectively. The peaks at 2944, 1575, and 744 cm −1 ascribed to the polyaromatic structure indicate that aromatization is invoked during degradation . The above results imply that the char from the AEPP/EP composite may be composed of phosphorus oxides, aluminum phosphate, and polyaromatic compounds, which can inhibit the combustion process and exhibit a better flame retardancy …”

Section: Resultsmentioning

confidence: 88%

Synthesis of aluminum ethylphenylphosphinate flame retardant and its application in epoxy resin

Yang

Wang

2018

Fire and Materials

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Summary A novel flame retardant additive, aluminum ethylphenylphosphinate (AEPP), was synthesized from diethyl phenylphosphonite and aluminum chloride hexahydrate, and characterized by FTIR, 1H NMR, and 31P NMR. AEPP was added into diglycidyl ether of bisphenol A epoxy resin (EP) cured by bisphenol A‐formaldehyde novolac resin. The flame retardancy of the cured EP was investigated by limited oxygen index, UL 94 test, and cone calorimeter test. The results revealed that the EP composite containing 15% AEPP had a limited oxygen index value of 28.2% with a UL 94 V‐0 rating. The incorporation of AEPP effectively decreased the peak heat release rate and the total heat release in cone calorimeter test analysis. Scanning electron microscopy results showed that the introduction of AEPP benefited to the formation of a smooth and continuous char layer during combustion of the flame retarded EP. The thermogravimetric analysis results indicated that the incorporation of AEPP promoted the initial decomposition of EP matrix, but AEPP/EP composites had a higher char yield at high temperatures. Moreover, the flexural properties of the flame retarded EP composites were studied.

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“…The opening of epoxide rings in the structure of DEP would induce chemical reaction with either carboxyl or amino end groups of PA6 to realize elongation of the macromolecular chains. Additionally, the yielded secondary amine and hydroxyl group may react with one equivalent of epoxide ring and form branching or cross‐linking structure …”

Section: Resultsmentioning

confidence: 99%

“…The feasible decomposition model of the composites at the elevated temperature in air atmosphere is proposed according to the literatures and results given above . The degradation pathway of PA6 is divided into two parts.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Flame‐Retarded Polyamide‐6 Composite Fabricated by Chain Extension

Wirasaputra

Luo

Liu

et al. 2016

Macro Materials & Eng

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The flame retardancy and mechanical properties of polyamide‐6 (PA6)/aluminum diethylphosphinate (AlPi) composite are greatly improved by the addition of novelly synthesized phosphorus flame retardant‐based diepoxide (DEP) during extrusion. The PA6/AlPi/DEP composite passes V‐0 rating of UL94 test with limiting oxygen index (LOI) of 32.6% at 13 wt% AlPi and 1 wt% DEP, as revealed by the results of flammability. The synergistic flame retardation mechanism offered by the two additives (AlPi and DEP) is studied in terms of in‐depth characterization of the charred residue and evolved gas. The deteriorated mechanical strength of PA6 due to existence of AlPi is compensated by the simultaneous chain extension effect of DEP. Accordingly, the flexural and impact strengths of PA6/AlPi/DEP composite are even superior to those of neat PA6.

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Flame retardancy mechanism of poly(butylene terephthalate)/aluminum diethylphosphinate composites with an epoxy-functional polysiloxane

Abstract: The manuscript presents an outstanding synergistic effect of aluminum diethylphosphinate (AlPi) and epoxy-functional polysiloxane (EPM) for preparing flame-retardant poly(butylene terephthalate) (PBT).

Cited by 27 publications

References 34 publications

Performance improvement of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate composites by epoxy-functional polysiloxane

Performance improvement of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate composites by epoxy-functional polysiloxane

Synthesis of aluminum ethylphenylphosphinate flame retardant and its application in epoxy resin

High‐Performance Flame‐Retarded Polyamide‐6 Composite Fabricated by Chain Extension

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