A novel flame-retardant modification strategy for UiO66-NH2 by encapsulating triethyl phosphate: preparation, characterization, and multifunctional application in poly (lactic acid)

X. G. Wang, P. Qi, S. J. Zhang, S. L. Jiang, Y. C. Li, J. Sun, B. Fei, X. Y. Gu, S. Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

This work reports a strategy to improve the flame-retardant efficiency of metal organic frameworks (MOFs). Herein, triethyl phosphate (TEP) was in situ encapsulated into the cavity of a zirconium-based MOF (UiO66-NH2) to prepare a compound flame retardant UiO@TEPx. The morphology, composition, crystal, and pore structure of UiO@TEPx were fully characterized. The introduction of UiO@TEP50 significantly improved the flame retardancy of poly (lactic acid) (PLA). The presence of 2% UiO@TEP50 upgraded the UL-94 level to V-0, improved the limiting oxygen index value to 24.2%, reduced the total smoke production by 29.5%, and decreased the peak heat release rate by 14.2% compared with that of the control PLA sample. The ‘thermosensitive release’ flame-retardant mechanism was proposed and porous smoke suppression function was demonstrated. Besides, PLA composites also showed excellent mechanical properties and apparent anti-UV effects. The tensile strength was increased to 59.7 MPa from 50.5 MPa, and the UV radiation transmittance was decreased to 6.4% from 71.3% compared with that of PLA. This work provides a novel flame-retardant modification strategy for encapsulating TEP into MOFs, which has not been reported so far.

Original languageEnglish
Article number101550
JournalMaterials Today Chemistry
Volume30
DOIs
Publication statusPublished - Jun 2023

Keywords

  • Encapsulation
  • Flame retardancy
  • Metal–organic framework
  • Poly (lactic acid)
  • Triethyl phosphate

ASJC Scopus subject areas

  • Catalysis
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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