4.7 Article

Construction of multifunctional linear polyphosphazene and molybdenum diselenide hybrids for efficient fire retardant and toughening epoxy resins

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 426, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131839

Keywords

LPP-MoSe2; Epoxy resin; Flame retardancy; Toughening

Funding

  1. National Natural Science Foundation of China [51973203]
  2. China Postdoctoral Special Funding [2019TQ0309, 2020M671904]

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By designing a new hierarchical MoSe2 nanotube structure and combining it with linear polyphosphazene, the LPP-MoSe2 hybrids demonstrate significant improvements in the flame retardancy and mechanical properties of EP, expanding the practical application of high-performance EP composites.
Epoxy resins (EP) are deemed as one kind of most commonly used thermosets, but immanently suffer from inflammability and brittleness. Herein, we report a newly designed hierarchical molybdenum diselenide (MoSe2) nanotubes assembled from several-layered nanosheets, and then merged with linear polyphosphazene (LPP) for constructing LPP-MoSe2 hybrids. LPP-MoSe2 possesses great advantages in improving the properties of EP for their typical nanotube structure and the combination effect of transition metal, phosphorous and nitrogenous compounds. The developed EP/LPP-MoSe2 composites present obvious reduction in flammability, obtaining a high LOI value of 29% and reaching V-D rating in UL-94 test. They also exhibit obvious reduction in the heat hazards of EP, such as peak heat release rate (39.0%) and total heat release (24.8%), as well as the toxicity hazards including total smoke production (31.3%) and the yields of CO and CO2. Gas-phase and condensed-phase mechanism are elucidated to explain the contribution of LPP-MoSe2 to the fire retardation of EP. Moreover, the addition of LPP-MoSe2 can also obviously enhance the mechanical properties of EP. The impact strength of EP is only 9 kJ/m(2), while EP/LPP-MoSe2 3.0 can reach up to 14.2 kJ/m(2). Based on tensile test, the well-dispersed LPP-MoSe2 also leads to significant elevation in tensile strength (74.6%) and elongation at break (100%) of EP. Our data demonstrate that LPP-MoSe2 shows impressive performance in developing high-performance EP composites, thereby broadening the practical application of EP.

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