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The sol-gel technique was utilized to prepare cellulose free-standing films using polyvinylidene flouride (PVDF) to induce hydrophobicity to inherently hydrophilic cellulose. The films were characterized by FTIR, Raman, SEM and XRD measurements. Contact angles of the water droplets placed on the prepared films were measured to ascertain their degree of hydrophobicity. The contact angle increased from 10 to 147 with the increase in the PVDF content, and then decreased with further addition of PVDF. The highest contact angle (147) was obtained for the cellulose/PVDF composite films with 42 wt% PVDF. The results were interpreted in terms of the interaction of the bonding of hydrogen molecules in water, modulating the nature of the surface of the cellulose/PVDF composite films.

INDUCING HYDROPHOBICITY IN CELLULOSE BY USING POLYVINYLIDENE DIFLUORIDE (PVDF) TO PRODUCE FREESTANDING CELLULOSE/PVDF COMPOSITE FILMS