Dry synthesis of mesoporous nanosheet assembly constructed by cyclomatrix polyphosphazene frameworks and its application in flame retardant polypropylene

Zhida Zhang, Zhongqiang Han, Ye Tang Pan*, Dinghua Li, De Yi Wang, Rongjie Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

Polyphosphazene is utilized in various fields due to its versatility and nontoxic nature; however, the polycondensation reaction in its preparation process relies on hazardous organic solvents and acid-binding agents. In this work, we proposed a synthetic method based on both molecule and nanostructure design to prepare cyclomatrix polyphosphazene frameworks in a green and sustainable manner without any solvent. Using block copolymer Pluronic F127 as the structural directing agent and porogen, the synthesized product was assembled by nanosheets with a mesoporous structure. The generality of the proposed strategy was also examined in depth. After being doped with cobalt, its structure-property relationship was studied in flame retarding polypropylene (PP). Polyphosphazene with a high specific surface area and unique morphology was first applied as an eco-friendly halogen-free flame retardant. With the addition of 18 wt% of the product, the flame retardant PP composite achieved a UL-94V-0 rating, with a limiting oxygen index of 26.7%. The peak of heat release rate and total smoke production were also reduced by 60.5% and 32.6%, respectively. The composite exhibited an outstanding water resistance, as evidenced by constant V-0 rating after soaking in water for 3 days. This systematic research will shed light on the advanced structural design and eco-benign synthesis strategy of polyphosphazene for more feasible applications.

Original languageEnglish
Article number125076
JournalChemical Engineering Journal
Volume395
DOIs
Publication statusPublished - 1 Sept 2020

Keywords

  • Cyclomatrix polyphosphazene frameworks
  • Flame retardant
  • Mesoporous nanostructure
  • Nanocomposites
  • Nanosheet assembly

Fingerprint

Dive into the research topics of 'Dry synthesis of mesoporous nanosheet assembly constructed by cyclomatrix polyphosphazene frameworks and its application in flame retardant polypropylene'. Together they form a unique fingerprint.

Cite this