Abstract
Fully bio-based non-isocyanate polyurethane (NIPU) was facilely prepared by self-condensation of primary amide of ricinoleic acid under oxidation conditions. The resulting linear urethane oligomer (Mn = 1300 Da) as a viscous liquid was further cured under UV light irradiation to afford a polymer film with hardness of lower than 2B. Infrared spectra as well as changes of polymer appearance proved crosslinking of the linear NIPU. Hardness of UV-cured film was promoted to 4H when a certain amount of cardanol was added to the linear urethane oligomer, accompanied by manifest improvement of resistance to chemical media such as aqueous HCl, EtOH, toluene and THF.
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