4.6 Article

Enhanced flame retardancy and mechanical properties of waterborne polyurethane based on the phosphorus and nitrogen containing polybutadiene acrylonitrile

Journal

JOURNAL OF APPLIED POLYMER SCIENCE
Volume 138, Issue 20, Pages -

Publisher

WILEY
DOI: 10.1002/app.50432

Keywords

DOPO; flame retardancy; HTBN; synergistic effect; waterborne polyurethane; synergistic effect

Funding

  1. Miaozi Project in Science and Technology Innovation Program of Sichuan Province [20-YCG045]
  2. Plan of Science and Technology Department of Sichuan Province, China [2020YFG0071, 2019YFG0257]
  3. National Natural Science Foundation of China [51903167, 51773129]

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A macromolecular intumescent flame retardant APBDH was designed to enhance the fire resistance of waterborne polyurethane, resulting in improved thermal stability and fire resistance of the flame retarded waterborne polyurethane. The addition of APBDH increased tensile strength and elongation at break of the material initially.
To further improve fire resistance of waterborne polyurethane, the macromolecular intumescent flame retardant (APBDH) was designed and prepared from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 4-aminothiophenol, benzaldehyde, and hydroxyl-terminated polybutadiene acrylonitrile (HTBN). Then, it was incorporated into waterborne polyurethane (WPU) to preparing flame retarded WPU (FR-WPU). TGA results suggested that the incorporation of APBDH into WPU increased thermal stability of FR-WPU. The fire resistance of FR-WPU were investigated by limiting oxygen index (LOI) test, the vertical burning test (UL-94), SEM-EDS analysis, the Laser Raman test, and cone calorimeter test. An LOI value of 28.82% and a UL-94 V-0 rating can be achieved when the WPU sample conjugated with 7.5 wt% APBDH. It indicated that the fire resistance of FR-WPU remarkably improved and displayed both gas and condensed phase mechanism. As the content of APBDH increased, the tensile strength and the elongation at break of FR-WPU increased firstly and then decreased. The thermo-mechanical behaviors indicated that the storage modulus increase at first and then descend with the addition of APBDH, while the T-gs firstly decreased and then increased. Additionally, the T-gh increased with the addition of APBDH.

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