Abstract: Guar gum was hydrophobically modified by condensation with dimer acid by microwave irradiation; the resulting product was used to prepare a film by mixing with poly vinyl alcohol. The preparation of condensation product and the film was optimized by variation of various reaction parameters. Products were characterized by FTIR spectroscopy, SEM, viscosity, tensile strength and permeability measurements. The application of films for food packaging is suggested on the basis of various properties and biodegradation in moist soil.

Keywords: Guar gum, dimer acid, hydrophobically modified guar gum, poly vinyl alcohol, biodegradation.