Journal
POLYMER DEGRADATION AND STABILITY
Volume 187, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2021.109548
Keywords
Epoxy resin; Bio-based; Co-curing agent; Flame retardance; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51573144]
- Natural Science Foundation of Hubei Province [ZRMS2019001284]
- Fundamental Research Funds for the Central Universities [WUT:2019III164CG, 205201033]
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By modifying epoxy resin with bio-based reactive flame retardant VFD, it can significantly improve the flame retardance and reduce the heat release rate, while also increasing the strength of EP. This shows great potential for practical application in the future.
To cater for the requirement of environmental protection, flame retardance and mechanical properties in some special fields for epoxy resin, a bio-based reactive flame retardant (VFD) derived from vanillin, furfurylamine and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was successfully synthesized via one-pot method, and served as co-curing agent of DDM to prepare the flame-retardant EP. The structure of VFD was characterized by Fourier transform infrared (FTIR) spectra and nuclear magnetic resonance (NMR). The addition of VFD accelerated the crosslinking reaction of epoxy system and improved the flame retardance of EP. With VFD content was 7.5 wt% (only 0.52 wt% phosphorus was loaded), EP/VFD-7.5 achieved vertical burning (UL-94) V-0 rating and its limited oxygen index (LOI) value increased to 34.5%. Besides, compared with EP, the peak heat release rate (PHRR) of EP/VFD-7.5 decreased by 28% in cone calorimeter (CC) test. The analysis of char residue and pyrolysis behavior confirmed that VFD exerted bi-phase flame-retardant effect. In spite of the decrease of flame-retardant EPs' T-g, the tensile and flexural strengths of EP/VFD-10 increased by 45% and 29%, respectively. All the results indicated the great potential of VFD for practical application in future. (C) 2021 Elsevier Ltd. All rights reserved.
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