Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xianwu Cao
  • Xiaoning Chi
  • Xueqin Deng
  • Bin Wang
  • Anthony C. Y. Yuen

Detail(s)

Original languageEnglish
Pages (from-to)1661-1670
Number of pages10
Journal / PublicationPolymers for Advanced Technologies
Volume31
Issue number7
Online published3 Mar 2020
Publication statusPublished - Jul 2020

Abstract

In order to improve the flame retardant of polylactide (PLA), the synergistic effect of graphitic carbon nitride (g-C3N4) 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-C3N4 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-C3N4 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-C3N4. In addition, the incorporation of DOPO can serve as a plasticizer to reduce the complex viscosity, improving the processability of PLA composites.

Research Area(s)

  • flame retardancy, graphitic carbon nitride, polylactide

Citation Format(s)

Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites. / Cao, Xianwu; Chi, Xiaoning; Deng, Xueqin; Liu, Tao; Yu, Bin; Wang, Bin; Yuen, Anthony C. Y.; Wu, Wei; Li, Robert K. Y.

In: Polymers for Advanced Technologies, Vol. 31, No. 7, 07.2020, p. 1661-1670.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review