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Flame Retardancy and Toughness of Poly(Lactic Acid)/GNR/SiAHP Composites

Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Lab of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
Author to whom correspondence should be addressed.
Polymers 2019, 11(7), 1129;
Received: 17 June 2019 / Revised: 27 June 2019 / Accepted: 27 June 2019 / Published: 3 July 2019
PDF [5166 KB, uploaded 3 July 2019]


A novel flame-retardant and toughened bio-based poly(lactic acid) (PLA)/glycidyl methacrylate-grafted natural rubber (GNR) composite was fabricated by sequentially dynamical vulcanizing and reactive melt-blending. The surface modification of aluminum hypophosphite (AHP) enhanced the interfacial compatibility between the modified aluminum hypophosphite by silane (SiAHP) and PLA/GNR matrix and the charring ability of the PLA/GNR/SiAHP composites to a certain extent, and the toughness and flame retardancy of the PLA/GNR/SiAHP composites were slightly higher than those of PLA/GNR/AHP composites, respectively. The notched impact strength and elongation of the PLA composite with 20 wt. %GNR and 18 wt.% SiAHP were 13.1 kJ/m2 and 72%, approximately 385% and 17 fold higher than those of PLA, respectively, and its limiting oxygen index increased to 26.5% and a UL-94 V-0 rating was achieved. Notedly, the very serious melt-dripping characteristics of PLA during combustion was completely suppressed. The peak heat release rate and total heat release values of the PLA/GNR/SiAHP composites dramatically reduced, and the char yield obviously increased with an increasing SiAHP content in the cone calorimeter test. The good flame retardancy of the PLA/GNR/SiAHP composites was suggested to be the result of a synergistic effect involving gaseous and condensed phase flame-retardant mechanisms. The high-performance flame-retardant PLA/GNR/SiAHP composites have great potential application as replacements for petroleum-based polymers in the automotive interior and building fields. View Full-Text
Keywords: PLA composite; flame retardancy; toughness; melt-dripping resistance; surface modification PLA composite; flame retardancy; toughness; melt-dripping resistance; surface modification

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Wu, N.; Yu, J.; Lang, W.; Ma, X.; Yang, Y. Flame Retardancy and Toughness of Poly(Lactic Acid)/GNR/SiAHP Composites. Polymers 2019, 11, 1129.

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