Fibers and Polymers

, Volume 19, Issue 6, pp 1194–1206 | Cite as

Influence of N-, P- and Si-based Flame Retardant Mixtures on Flammability, Thermal Behavior and Mechanical Properties of PA6 Composite Fibers

  • Alisa Šehić
  • Jelena Vasiljević
  • Igor Jordanov
  • Andrej Demšar
  • Jožef Medved
  • Ivan Jerman
  • Marija Čolović
  • Fiona Hewitt
  • T. Richard Hull
  • Barbara SimončičEmail author


This research investigated the influence of two flame retardant (FR) mixtures consisting melamine cyanurate (MeCy) and aluminum diethylphosphinate (AlPi), and MeCy and sodium aluminosilicate (SASi) at different weight ratios, on the flammability, thermal behavior and mechanical properties of polyamide 6 (PA6) composite yarns produced by meltspinning. The morphological and chemical properties of PA6/FR filaments were investigated by scanning electron microscopy and Fourier-transform infrared spectroscopy, flame retardancy by vertical burning test UL-94, thermal behavior by thermogravimetric and differential scanning calorimetric analyses, and mechanical properties by tensile tests. The results indicate that within the UL 94 V2 rating, the composite yarns differed significantly from each other in their burning and dripping behavior. The incorporation of both mixtures, MeCy+AlPi and MeCy+SASi, into the PA6/FR yarns significantly decreased the afterflame time relative to pristine PA6, confirming a lower production of flammable volatiles. This phenomenon was attributed mainly to MeCy, which caused an immediate extinguishment of the flame after the withdrawal of the igniting flame. Compared to one component MeCy, the incorporation of the MeCy+SASi mixture enhanced the thermooxidative stability of the PA6/FR yarns because of their additive effect at higher concentrations. In contrast, an antagonistic effect was obtained for the MeCy+AlPi mixture, irrespective of the concentration. Since the incorporation of MeCy+SASi did not drastically reduce the tensile properties of filaments, this mixture enables the production of the PA6/MeCy+SASi composite yarns with the enhanced flame retardancy and thermo-oxidative stability.


Polyamide 6 Composite filament yarns Flame retardant additive Flammability Thermo-oxidative stability Mechanical properties 


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Copyright information

© The Korean Fiber Society and Springer Nature B.V. 2018

Authors and Affiliations

  • Alisa Šehić
    • 1
  • Jelena Vasiljević
    • 2
  • Igor Jordanov
    • 3
  • Andrej Demšar
    • 2
  • Jožef Medved
    • 2
  • Ivan Jerman
    • 4
  • Marija Čolović
    • 4
  • Fiona Hewitt
    • 5
  • T. Richard Hull
    • 5
  • Barbara Simončič
    • 2
    Email author
  1. 1.AquafilSLO d. o. o.LjubljanaSlovenia
  2. 2.University of LjubljanaFaculty of Natural Sciences and EngineeringLjubljanaSlovenia
  3. 3.Ss. Cyril and Methodius UniversityFaculty of Technology and MetallurgySkopjeMacedonia
  4. 4.National Institute of ChemistryLjubljanaSlovenia
  5. 5.Centre for Fire and Hazards ScienceUniversity of Central LancashirePrestonUnited Kingdom

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