Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

Yuan Xue; Rongjing Zhao; Ling Zhang; Chunzhong Li

doi:10.1016/j.cjche.2020.03.034

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Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene

Materials and Product Engineering | Updated：2026-01-06

- Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene
- Chinese Journal of Chemical Engineering Issue 6, Pages: 1725-1732(2020)
- Affiliations：
  
  Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology,Shanghai,China,200237
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2020.03.034
  CLC：
- Published：2020
- Accepted：
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Yuan Xue, Rongjing Zhao, Ling Zhang, et al. Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene[J]. Chinese Journal of Chemical Engineering, 2020, (6): 1725-1732.
DOI：

Yuan Xue, Rongjing Zhao, Ling Zhang, et al. Flame retardant synergy between interfacial and bulk carbonation in glass fiber reinforced polypropylene[J]. Chinese Journal of Chemical Engineering, 2020, (6): 1725-1732. DOI： 10.1016/j.cjche.2020.03.034.

摘要

Abstract

Glass fiber reinforced polypropylene (GF-PP) composites have high flammability on account of wick effect which leads to accelerated flow of the polymer melt along the glass fibers (GF) surface to the flame zone. In this study

dipentaerythritol (DPER)

a charring agent

was adsorbed on the GF surface through the hydrogen bond between silane coupling agent and DPER. DPER has a synergistic effect with the intumescent flame retardants (IFR) added in the composites

which can induce interfacial carbonization on the surface of GF

thus transforming the intrinsic smooth GF surface into roughness one. In this way

the negative effect of the wick effect in flame retardancy is weakened. Moreover

the char residues remained on the surface of GF can bring an improved adhesion between GF and char residues formed in the resin so that a more stable barrier char layer is formed. The PP composites with 20 wt% modified glass fiber (M-GF) and 30 wt% IFR can achieve the UL-94V-0

and its limiting oxygen index (LOI) value increased from 16.5% to 29.5%. Simultaneously

the heat release rate (HRR)

total heat release (THR) and total smoke release (TSR) decreased significantly

and the peak of heat release rate (PHRR) reduced 60.6% compared with GF-PP.

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