POLYMERS AND POLYMER MATRIX COMPOSITES |
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Construction of Biobased Core-shell Flame Retardant by Electrostatic Adsorption for the Flame Retardant Modification of Kraft Paper |
GENG Yaru, YANG Guochao, XU Bingbing, ZHANG Qiuhui*
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MOE Key Laboratory of Wooden Material Science and Application, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China |
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Abstract Aiming at improving the disadvantages of ammonium polyphosphate (APP) that caused surface discoloration and lower mechanical properties of the substrate, and meeting the green development requirement simultaneously, a biobased flame retardant (APP@EP) with core-shell structure was fabricated. Sodium phytate (PA-Na) and egg white protein (EWP) were used as shell materials, which were deposited on the surface of APP layer by layer through electrostatic adsorption in aqueous solution. Then APP@EP was applied to kraft paper through the coating process, and the flame resistance and mechanical properties of flame retardant kraft papers were investigated. Thermal gravimetric (TG) analysis indicated that the thermal stability of APP@EP was improved significantly at high temperature, and the residual mass reached 56.7% at 700 ℃. The limiting oxygen index (LOI) value of APP@EP treated kraft paper was increased from 19.8% to 45.2%, and the char length was decreased from 210 mm to 41 mm. Compared with APP treated kraft paper, the peak of heat release rate (PHRR) and total heat release (THR) of APP@EP treated kraft paper decreased by 35.91% and 44.98%, and the tensile index increased by 24.92%. Further analysis of residues demonstrated that after the combustion of APP@EP treated kraft paper, a complete and dense carbon layer containing P-O-P and P-O-C structures was formed with higher degree of graphitization.
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Published: 10 March 2023
Online: 2023-03-14
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Fund:National Natural Science Foundation of China (31670564). |
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