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

1
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2
Shenzhen Halcyon New Materials Co., Ltd., Shenzhen 518116, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(14), 2217; https://doi.org/10.3390/ma12142217
Received: 14 June 2019 / Revised: 2 July 2019 / Accepted: 8 July 2019 / Published: 10 July 2019
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Abstract

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. View Full-Text
Keywords: polyamide 6; chain extension; flame retardancy; Schiff base; mechanical properties polyamide 6; chain extension; flame retardancy; Schiff base; mechanical properties
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Liang, T.; Cai, J.; Liu, S.; Lai, H.; Zhao, J. Chain Extension and Synergistic Flame-Retardant Effect of Aromatic Schiff Base Diepoxide on Polyamide 6/Aluminum Diethylphosphinate Composites. Materials 2019, 12, 2217.

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