Abstract: Cardanol aldehyde condensation resin(CF) is susceptible to corrosion by alkali because of its slight acidity of phenolic hydroxyls.CF was modified by aniline, followed by reaction with CuCl₂.The final product of the co condensation polymer containing copper nitrogen coordinated bond(CFNCu) has been synthesized and characterized by IR, dynamic mechanical thermogram analysis(DMTA) and other measures.Results show that copper nitrogen coordinated bond increases the cross linking of coating film, leading to the remarkable improvements of physico mechanical properties, thermo stability and resistance against chemical media, especially alkali.

Key words: cashew nut shell liquid, cardanol-aldehyde condensation polymer, aniline, Cu-N coordinated bond