Effect of Ulexite on Mechanical, Thermal, and Flame Properties of Halogen-Free Fire Retardant Polypropylene

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Altay L. , Seki Y., Uysalman T., Tantug G. S. , İşbilir A., Sarıkanat M.

ACTA PHYSICA POLONICA A, cilt.135, no.1, ss.1143-1146, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 135 Konu: 5
  • Basım Tarihi: 2019
  • Doi Numarası: 10.12693/aphyspola.135.1143
  • Sayfa Sayısı: ss.1143-1146


In this study it was aimed to improve the fire retardant performance of halogen free flame-retardant polypropylene by increasing limiting oxygen index value. Ammonium polyphosphate, pentaerythritol, and ulexite were used to improve flame retardancy of polypropylene. Ulexite powder filled (1, 2, and 4 wt%) polypropylene composites were obtained by using a twin-screw extruder and injection molding method. Thermal, mechanical, and flame retardant performances of polypropylene composites were investigated by several characterization techniques. Limiting oxygen index value was obtained higher than 45% when ulexite was added into polypropylene at 1-4 wt%. It was observed that flame retardant additives do not change the mechanical properties considerably. The effect of ulexite addition on melting and crystallization temperatures of polypropylene-based composite is not pronounced.