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Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites
Author(s) -
Cao Xianwu,
Chi Xiaoning,
Deng Xueqin,
Liu Tao,
Yu Bin,
Wang Bin,
Yuen Anthony C. Y.,
Wu Wei,
Li Robert K. Y.
Publication year - 2020
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4894
Subject(s) - materials science , fire retardant , char , cone calorimeter , melamine , composite material , limiting oxygen index , chemical engineering , pyrolysis , engineering
In order to improve the flame retardant of polylactide (PLA), the synergistic effect of graphitic carbon nitride (g‐C 3 N 4 ) with commercial‐available flame retardants melamine pyrophosphate (MPP) and 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) was investigated. The PLA composites containing 5 wt% g‐C 3 N 4 and 10 wt% DOPO had a highest limited oxygen index (LOI) value of 29.5% and reached the V‐0 rating of UL‐94 test. The cone calorimeter tests exhibited that DOPO had a better synergistic effect with g‐C 3 N 4 than MPP to improve flame retardancy of PLA. The peak heat release rate (pHRR) and total heat release (THR) of PLA composites containing 10 wt% DOPO could be reduced by 25.2% and 23.6%, respectively, as compared with those of pure PLA. The presence of rich phosphorus element and aromatic groups in DOPO contributed to obtain continuous compact char layer and increase the graphitization level of char residues, thereby, resulting in improving the flame retardancy of PLA together with g‐C 3 N 4 . In addition, the incorporation of DOPO can serve as a plasticizer to reduce the complex viscosity, improving the processability of PLA composites.