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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.
Funding
The work was financially supported by the Natural Science Foundations of China (No. 21264008), the Natural Science Foundations of Jiangxi Province (No. 2009GZH0035), and the 7th Foundation of Creativity and Study for College Students in Jiangxi Science & Technology Normal University.