Bio-based benzoxazine monomers and polymers based on difuran diamine was written by Yu, Mengwen;Yadav, Santosh K.;La Scala, John J.;Palmese, Giuseppe R.. And the article was included in Journal of Applied Polymer Science in 2022.SDS of cas: 499-75-2 This article mentions the following:
Benzoxazine monomers with high renewable content made from difuran diamine (DFDA) are presented. The benzoxazine monomers were synthesized by reacting DFDA with several bio-based phenolic compounds and formaldehyde. These systems were purified by precipitation, and depending on composition, the resulting solid powders melt at temperatures ranging between 50 and 150°C to form low viscosity liquids that can be used to impregnate fiber reinforcements. Onset cure temperature varies depending on composition in the range of 150-240°C. The resulting polybenzoxazines have Tg’s ranging from 240 to 300°C. It was found that the phenolic structure selected affects curing mechanisms of the DFDA-based benzoxazines, benzoxazines that have available ortho or para positions on the phenolic structures result in cure without mass loss. It was also found that adding furan rings into the backbone of the polybenzoxazine network provided the added benefit of char yield as high as 60%, as measured by thermal gravimetric anal. temperature ramps in an inert environment to 800°C. Compared with benzene-ring-based benzoxazine counterparts, furan-based benzoxazines showed better thermal stability. In addition to promising processing and thermal characteristics useful for applications requiring high temperature and fire resistance, these materials contain high renewable content. In the experiment, the researchers used many compounds, for example, 5-Isopropyl-2-methylphenol (cas: 499-75-2SDS of cas: 499-75-2).
5-Isopropyl-2-methylphenol (cas: 499-75-2) belongs to alcohols. The oxygen atom of the strongly polarized O―H bond of an alcohol pulls electron density away from the hydrogen atom. This polarized hydrogen, which bears a partial positive charge, can form a hydrogen bond with a pair of nonbonding electrons on another oxygen atom. Tertiary alcohols cannot be oxidized at all without breaking carbon-carbon bonds, whereas primary alcohols can be oxidized to aldehydes or further oxidized to carboxylic acids.SDS of cas: 499-75-2
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts