Chain Extension and Synergistic Flame-Retardant Effect of Aromatic Schiff Base Diepoxide on Polyamide 6/Aluminum Diethylphosphinate Composites

Chain Extension and Synergistic Flame-Retardant Effect of Aromatic Schiff Base Diepoxide on Polyamide 6/Aluminum Diethylphosphinate Composites

A way to suppress the deterioration in mechanical properties of polyamide 6 (PA6) is required, especially with high loading of flame retardants in the matrix. In this study, a novel aromatic Schiff base diepoxide (DES) was synthesized. It exhibited an efficient chain extension effect on PA6 and a sy...

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Bibliographic Details
Published in:Materials Vol. 12; no. 14; p. 2217
Main Authors: Liang, Tianxiang, Cai, Jianan, Liu, Shumei, Lai, Hualin, Zhao, Jianqing
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 10-07-2019
MDPI
Subjects:
Aluminum
Aramid fibers
chain extension
Chains
Ethanol
flame retardancy
Flame retardants
Imines
Impact strength
Incorporation
Mechanical properties
Nitrogen
NMR
Nuclear magnetic resonance
Phosphorus oxides
polyamide 6
Polyamide resins
Polymer matrix composites
Polyphosphates
Potash
Potassium
Pyrolysis
Residues
Sample size
Schiff base
Spectrum analysis
Synergistic effect
Thickness
United Kingdom > UK
China
Japan
Germany
Schiff base
flame retardancy
chain extension
mechanical properties
polyamide 6
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Summary:A way to suppress the deterioration in mechanical properties of polyamide 6 (PA6) is required, especially with high loading of flame retardants in the matrix. In this study, a novel aromatic Schiff base diepoxide (DES) was synthesized. It exhibited an efficient chain extension effect on PA6 and a synergistic flame-retardant effect with aluminum diethylphosphinate (AlPi) for PA6. The PA6 composite with 16 wt.% AlPi only passed UL-94 V-0 rating at 1.6 mm thickness, while the combination of 1.5 wt.% DES with 13 wt.% AlPi induced PA6 to achieve a UL-94 V-0 rating at 0.8 mm thickness. The tensile, flexural, and Izod notched impact strengths were increased by 16.2%, 16.5%, and 24.9%, respectively, compared with those of V-0 flame-retarded PA6 composites with 16 wt.% AlPi. The flame-retarded mechanism of PA6/AlPi/DES was investigated by cone calorimetry and infrared characterization of the char residues and pyrolysis products. These results showed that DES had a synergistic effect with AlPi in condensed-phase flame retardation by promoting the production of aluminum phosphorus oxides and polyphosphates in the char residues.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma12142217