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<p>To develop flame-retardant cable sheath/insulation materials with balanced mechanical properties, high-density polyethylene (HDPE) / ethylene-vinyl acetate copolymer (EVA) composites were investigated using the intumescent flame retardant (IFR, composed by ammonium polyphosphate and pentaerythritol) and linear poly(bisphenoxyphosphazene) oligomer (LPPZ) as the flame retardants. The rheological behavior of flame-retardant HDPE/EVA composites was demonstrated through the torque-time relationship during processing, which reflects the interaction between the polymer chains (including HDPE and EVA) and the LPPZ oligomer. Such interactions enhanced both mechanical performance and flame retardancy. Through characterization by the limiting oxygen index (LOI), UL-94 rating, cone calorimeter and tensile tests, the effect of IFR/LPPZ system on the flame retardancy and mechanical property of HDPE/EVA blends were analyzed. Results indicated that composites containing 11.25 phr IFR and 3.75 phr LPPZ achieved a UL-94&#xa0;V-0 rating with optimal tensile strength (16.1&#xa0;MPa) and significantly increased elongation at break (98.2%). Furthermore, flame-retardant mechanisms in both gaseous and condensed phases were elucidated.‌</p>

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Superior flame retardancy and mechanical property of HDPE/EVA composites enhanced by linear poly(bisphenoxyphosphazene) oligomer

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Jinkang Wu,
  • Saifei Xiang,
  • Zitong Hu,
  • Jingqi Lu,
  • Jianbo Ying,
  • Yan Zhang

摘要

To develop flame-retardant cable sheath/insulation materials with balanced mechanical properties, high-density polyethylene (HDPE) / ethylene-vinyl acetate copolymer (EVA) composites were investigated using the intumescent flame retardant (IFR, composed by ammonium polyphosphate and pentaerythritol) and linear poly(bisphenoxyphosphazene) oligomer (LPPZ) as the flame retardants. The rheological behavior of flame-retardant HDPE/EVA composites was demonstrated through the torque-time relationship during processing, which reflects the interaction between the polymer chains (including HDPE and EVA) and the LPPZ oligomer. Such interactions enhanced both mechanical performance and flame retardancy. Through characterization by the limiting oxygen index (LOI), UL-94 rating, cone calorimeter and tensile tests, the effect of IFR/LPPZ system on the flame retardancy and mechanical property of HDPE/EVA blends were analyzed. Results indicated that composites containing 11.25 phr IFR and 3.75 phr LPPZ achieved a UL-94 V-0 rating with optimal tensile strength (16.1 MPa) and significantly increased elongation at break (98.2%). Furthermore, flame-retardant mechanisms in both gaseous and condensed phases were elucidated.‌