Highly Flame‐Retarded Epoxy Thermoset Imparted by Bio‐Based Phosphorus/Nitrogen‐Containing Furan Derivative with Enhanced Mechanical Toughness

• DOI: 10.1002/mame.202100981
• Publication Date: 2022-03-09T08:34:24Z
• Authors: Liyun Fu; Xing liu; Yubin Zhou; Minghong Wu; Shumei Liu; Jianqing Zhao; Yueqi Mo
• Keywords: Thermosetting polymer; Limiting oxygen index; Diglycidyl ether; Furan

Abstract A bio‐based phosphorus/nitrogen‐containing furan derivative, 6,6′′,6′′′‐((((1,3,5‐triazine‐2,4,6‐triyl) tris(oxy))tris(benzene‐4,1‐diyl))tris(((furan‐2‐ylmethyl) amino)methylene)) tris(dibenzo[c,e][1,2]oxaphosphinine 6‐oxide) (TFAD) is successfully synthesized and characterized by Fourier transform infrared spectroscopy nuclear magnetic resonance spectroscopy. The introduction of TFAD clearly lowers the activation energy for diglycidyl ether a bisphenol (DGEBA)/4,4′‐diaminodiphenyl methane (DDM) system. DGEBA/DDM/ thermoset achieves UL‐94 V‐0 rating possesses limiting oxygen index (LOI) 30.1% as content phosphorus up to 0.41 wt.%. Further, compared with unmodified epoxy thermoset, its peak heat release rate total experience 42.0% 14.8% decrement, respectively. flame‐retardant mechanism analysis confirms that exerts fire‐retardant effect in both gaseous condensed phases. Meanwhile, impact strength enhanced 35.6%, from 19.5 kJ m –2 EP‐0 26.5 . This work provides novel strategy construct superior flame‐retarded thermosets admirable performance.