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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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A Multi-Material Flame-Retarding System Based on Expandable Graphite for Glass-Fiber-Reinforced PA6.

Florian Tomiak1,2, Melanie Zitzmann1,2, Dietmar Drummer1,2

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A novel flame retardant system using expandable graphite, aluminum diethylphosphinate, melamine polyphosphate, and montmorillonite significantly enhances polyamide 6 fire safety. This synergistic approach achieves UL-94 V0 rating with excellent char stability.

Keywords:
PA6aluminum diethylphosphinateexpandable graphiteflame retardancymelamine polyphosphatemontmorillonite

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Fire Safety Engineering

Background:

  • Polyamide 6 (PA6) is a widely used engineering thermoplastic.
  • Enhancing the flame retardancy of PA6 is crucial for its application in demanding environments.
  • Existing flame retardant systems often face challenges in balancing efficiency, environmental impact, and mechanical properties.

Purpose of the Study:

  • To develop and evaluate a synergistic multi-material flame retardant system for glass-fiber-reinforced polyamide 6 (PA6).
  • To investigate the flame-retardant mechanism and performance of the developed system.
  • To assess the impact of the flame retardant system on the thermal stability and char formation of PA6.

Main Methods:

  • Preparation of PA6 composites incorporating expandable graphite (EG), aluminum diethylphosphinate (AlPi), melamine polyphosphate (MPP), and montmorillonite (MMT).
  • Fire performance evaluation using UL-94 vertical burning tests and limiting oxygen index (LOI) measurements.
  • Thermal analysis via coupled thermogravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FTIR).
  • Cone calorimetry for assessing heat release rate (HRR), maximum average heat release rate (MAHRE), and total smoke production (TSP).
  • Char residue analysis, including mechanical stability tests.

Main Results:

  • The synergistic EG/AlPi/MPP/MMT system at 20 wt.% achieved a UL-94 V0 classification and an LOI of 32% in PA6 (25 wt.% glass fiber).
  • Significantly reduced heat release rates were observed, with a peak HRR of 103 kW/m² and MAHRE of 33 kW/m².
  • Total smoke production (TSP) was notably low at 3.8 m².
  • Exceptional char residue stability was demonstrated, withstanding an areal weight of 35 g/cm² without deformation.

Conclusions:

  • The synergistic multi-material flame retardant system effectively enhances the fire safety of glass-fiber-reinforced PA6.
  • The system promotes strong char formation, leading to reduced flammability and smoke emission.
  • The developed flame retardant composite exhibits superior thermal stability and char integrity, suitable for high-performance applications.