The effect of surface treatment of jute fibre by aqueous NaOH solution and cardanol formaldehyde (CF) was evaluated by Diffuse Reflectance Fourier Transform infrared spectroscopy (DRIFT) and Carbon-13 nuclear magnetic resonance spectroscopy (C13-NMR) and the fibre tensile properties and the fibre water absorption were measured. Composites based on untreated and treated fibres and common thermoplastic films (LDPE, HDPE and PP) were also prepared by hot press moulding. Treatment of jute fibre with CF reduced the water absorption of composites and improved the tensile and flexural strength, especially when the samples were immersed in water.
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