(157b) Bio-Based Benzoxazine Monomers and Polymers Based on Difuran Diamine?Dfda?
AIChE Annual Meeting
2019 AIChE Annual Meeting
Process Development Division
Process Innovations on Renewable Polymers and Biobased Intermediates
Monday, November 11, 2019 - 12:48pm to 1:06pm
A new class of benzoxazine monomers based on difuran diamine (DFDA) obtained by the coupling of furfuryl amine using formaldehyde will be discussed. The benzoxazine monomers were synthesized by reacting DFDA with a number of bio-based phenolic compounds and formaldehyde. These systems were purified by precipitation. Depending on composition, the resulting solid powders melt at temperatures ranging between 70Â°C and 150Â°C to form low viscosity liquids that can be readily used to impregnate fiber reinforcements. Onset cure temperature also varies depending on composition in the range of 120Â°C-240Â°C. The resulting polybenzoxazines have Tgâs ranging from 220Â°C to 320Â°C. It was found that adding furan rings into the backbone of the polybenzoxazine network provides the added benefit of 800Â°C char yield as high as 70% as measured by TGA temperature ramps in an inert environment. In addition to promising processing and thermal characteristics useful for applications requiring high temperature ablation resistance, these materials contain high renewable content.