Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 16, Pages 14074-14088Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02629
Keywords
Isoeugenol; Phosphate flame retardant; Biobased resins; Epoxy thermosets; High performance
Categories
Funding
- Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program [744349]
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A biobased reactive phosphate flame retardant derived from isoeugenol was synthesized and fully characterized (H-1, C-13, P-31 NMR, FTIR, MS) with the aim of improving flame retardancy behavior of biobased epoxy thermosets. This new green flame retardant, diepoxyisoeugenol phenylphosphate (DEpiEPP), was then copolymerized either with conventional diglycidyl ether of bisphenol A resin (DGEBA) or with a totally biobased glycidyl ether epoxy isoeugenol (GEEpiE) resin using a biobased camphoric anhydride (CA) as hardener. Resulting thermosets with varying rates of flame retardant (1.0 to 4.3 wt % phosphorus) were then characterized (FTIR, DSC, nanoindentation, three-point bending test, TGA, PCFC, cone calorimeter). In this way, a new solution was proposed allowing (i) to increase the biobased content of thermosets, (ii) to improve the flame retardancy properties by a reactive way, and (iii) to provide epoxy thermosets with high T-g, excellent mechanical properties, and a curing temperature compatible with the use of vegetable fibers. For instance, with a weight content of 2.0 wt % P, both GEEpiE-CA-DEpiEPP (95% biobased content) and partially biobased DGEBA-CA-DEpiEPP (57% biobased content) epoxy thermosets possess high T-g (respectively 129 and 105 degrees C) and bending elastic modulus and strength of respectively 4.08 GPa and 90 MPa and demonstrate good flame-retardant properties due to char promotion showing high promise for application.
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