Scholarlink

<p>As a bio-based and biodegradable aliphatic polyester, poly(lactic acid) (PLA) holds great promise as a sustainable alternative to conventional petroleum-derived plastics. However, its inherent flammability remains a critical barrier to its use in advanced polymer composites requiring stringent fire-safety standards. In this work, a phosphorus/nitrogen-containing flame retardant (FMPO) was synthesized from melamine (MEL), formaldehyde (FA) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) at a 1:1 molar ratio to serve as a flame-retardant modifier for PLA. The results demonstrated that with only 1 wt% FMPO loading, the PLA composite achieved a UL-94 V-0 rating, and the limiting oxygen index (LOI) increased significantly to 33.2% by 5 wt%. At the same flame retardant content, PLA/5MEL only showed a LOI of 26.8% and a UL-94 V-2 rating. Meanwhile, the mechanical strength of PLA/5FMPO was significantly improved, exhibiting 136% and 41% higher impact strength and tensile strength than PLA/5MEL. The analysis of char residue and incomplete combustion products revealed that FMPO exhibits a bi-phase flame-retardant effect, characterized by gaseous-phase inert-gas dilution and radical quenching, along with a condensed-phase thermal barrier from the carbon layer. This study demonstrates an efficient and sustainable strategy for fabricating high-performance, flame-retardant PLA materials through P/N synergistic fire resistance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Phosphorus/Nitrogen-containing Phosphaphenanthrene Derivative as Flame Retardant for Poly(lactic acid)

  • 期刊论文

  • 发表日期：

    2026年5月14日

查看全文
  • Shan Lin,
  • Hong-Yan Zhu,
  • Chun-Meng You,
  • Da-Ming Ban

摘要

As a bio-based and biodegradable aliphatic polyester, poly(lactic acid) (PLA) holds great promise as a sustainable alternative to conventional petroleum-derived plastics. However, its inherent flammability remains a critical barrier to its use in advanced polymer composites requiring stringent fire-safety standards. In this work, a phosphorus/nitrogen-containing flame retardant (FMPO) was synthesized from melamine (MEL), formaldehyde (FA) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) at a 1:1 molar ratio to serve as a flame-retardant modifier for PLA. The results demonstrated that with only 1 wt% FMPO loading, the PLA composite achieved a UL-94 V-0 rating, and the limiting oxygen index (LOI) increased significantly to 33.2% by 5 wt%. At the same flame retardant content, PLA/5MEL only showed a LOI of 26.8% and a UL-94 V-2 rating. Meanwhile, the mechanical strength of PLA/5FMPO was significantly improved, exhibiting 136% and 41% higher impact strength and tensile strength than PLA/5MEL. The analysis of char residue and incomplete combustion products revealed that FMPO exhibits a bi-phase flame-retardant effect, characterized by gaseous-phase inert-gas dilution and radical quenching, along with a condensed-phase thermal barrier from the carbon layer. This study demonstrates an efficient and sustainable strategy for fabricating high-performance, flame-retardant PLA materials through P/N synergistic fire resistance.