New aromatic amine based on cardanol giving new biobased epoxy networks with cardanol

Abstract

Cardanol, derived from cashew nut shell liquid, was functionalized by thiol‐ene coupling with cysteamine to yield a new biobased aromatic amine. This cardanol amine was compared to the commercial cardanol‐based phenalkamines. These amines were characterized by NMR spectrometry and used as epoxy hardeners. The formulations of these amines with epoxidized cardanol in stoichiometric ratio were characterized by differential scanning calorimetry (DSC), thermogravimetry (TGA), dynamic mechanical (DMA) analyses and exhibit interesting properties for coating applications.Practical applications: The products of the chemistry described in this contribution, i.e., aromatic polyamine from cardanol and cysteamine hydrochloride, provide biobased building blocks for further epoxy resin syntheses by reaction with epoxy groups. The obtained epoxy resins are partially biobased and may be applied as binders and coatings.Biobased aromatic polyamine was synthesized by thiol‐ene coupling with cysteamine on cardanol, coming from cashew nut shell liquid (CNSL). Cardanol‐derived amine was used as hardener in biobased epoxy networks. Mechanical and thermal properties of obtained materials showed that cardanol‐derived amine material could lead to binders for composite application.