Effects of novel phosphorus-nitrogen-containing DOPO derivative salts on mechanical properties, thermal stability and flame retardancy of flexible polyurethane foam

Shicong Ma, Yuling Xiao, Feng Zhou, Bernhard Schartel, Yin Yam Chan, Oleg P. Korobeinichev, Stanislav A. Trubachev, Weizhao Hu, Chao Ma, Yuan Hu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this work, a series of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivative salts containing phosphorus and nitrogen were synthesized, and their effects on mechanical properties, thermal stability and flame retardancy of flexible polyurethane foam (FPUF) were investigated. Studies have shown that the addition of DOPO derivatives will increase the tensile strength, compression set, and compression hardness of FPUF, but it will lead to a decrease in elongation at break. Thermogravimetric analysis showed that the initial decomposition temperature of FPUF containing DOPO derivatives was reduecd, but the char reside was significantly improved. A series of combustion tests indicated that the addition of DOPO derivative salts can improve the flame retardancy of FPUF, of which 10-hydroxy-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide dicyandiamide salt (D-DICY) exhibited the best flame retardancy. When the load of D-DICY was 20 phr, the limiting oxygen index (LOI) of foam reached 24.5%, and the peak heat release rate and total heat release were decreased by 55.7% and 52.9%, respectively. Furthermore, based on the analysis of the gas phase combustion products and the char residue of the condensed phase, the possible flame retardant mechanism was proposed.

Original languageEnglish
Article number109160
Number of pages11
JournalPolymer Degradation and Stability
Volume177
DOIs
Publication statusPublished - Jul 2020

Keywords

  • DOPO derivative salts
  • Flame retardancy
  • Flexible polyurethane foam
  • Mechanical properties
  • Thermal stability
  • FIRE HAZARD
  • PERFORMANCE
  • DECOMPOSITION
  • ZIRCONIUM-PHOSPHATE
  • RESINS
  • FRAMEWORKS
  • CONSTRUCTION
  • SMOKE-SUPPRESSANT
  • COATINGS
  • HYBRID

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