Cyclotriphosphazene-Based Intumescent Flame Retardant against the Combustible Polypropylene

Panyue Wen, Qilong Tai, Yuan Hu, Richard K.K. Yuen

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Flame retardant polypropylene (PP) was obtained through appropriately blending with microencapsulated ammonium polyphosphate (MAPP) and a novel cyclotriphosphazene-based char-forming agent (CPCFA) and synthesized using a one-pot method in high yield (86.5%). An increase in the limiting oxygen index (LOI) and the observation of a vertical burning (UL-94) V-0 rating as well as the reduction of the heat release rate (HRR) and residual mass of PP/MAPP/CPCFA blends compared to those for PP/MAPP demonstrated the effectivess of a contribution of MAPP and CPCFA to PP in flame PP. Thermogravimetric analyses results demonstrated that the presence of CPCFA improved char formation for PP/MAPP/CPCFA blends in either nitrogen or air atmosphere. Finally, an outstanding water resistance was also obtained for compositions in the weight ratio range of 3:1 to 2:1 (MAPP/CPCFA). After water soaking for 72 h, a UL-94 V-0 rating was still achievable.

Original languageEnglish
Pages (from-to)8018-8024
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number29
Publication statusPublished - Jul 27 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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