PREPARASI FILM KOMPOSIT KITOSAN?TiO2 DAN UJI BIODEGRADABILITASNYA; PREPARATION OF COMPOSITE CHITOSAN?TiO2 FILMS AND THE BIODEGRADABILITY TEST

Tri Wahyuningsih, Indriana Kartini

2011 | Disertasi | PROGRAM STUDI S2 ILMU KIMIA

The effect of chitosan concentration, glycerol and crystalline phases of TiO2 on the mechanical properties, UV light resistances and biodegradability of chitosan?based films has been studied. Film preparation was done by solvent casting. Chitosan concentrations were varied at 0.5, 1 and 2% (w/v) with variation of glycerol of 0.2; 0.4 and 0.6 ml/g chitosan as plasticizer. Amorphous TiO2 (Am), anatase (A), and anatase?rutile (AR) were used. Infrared spectra of the resulted films indicated that the addition of glycerol and TiO2 did not alter the molecular structure of chitosan. The X?ray diffraction (XRD) patterns indicated that the addition of glycerol and TiO2 increased the crystallinity of chitosan films and identified the crystalline phases of TiO2. TS (tensile strenght) of chitosan films increased as increasing chitosan concentrations from 1.66 to 18.75 MPa but the elongation at break was optimum at 10.4% for 1% (w/v) chitosan films. The addition of glycerol increased TS up to 61.43 MPa and elongation at break up to 12.72%. The addition of TiO2 decreased TS and elongation at break of the films with the worst decrement for film composite of chitosan?TiO2 Am from 50.11 MPa to 0.21 MPa and from 12.72% to 5.4%, respectively. Among the film composites, chitosan?TiO2 AR has shown the highest mechanical properties (TS of 17.18 MPa, elongation at break of 13.5%) and the highest film opacity. The later property indicated the highest UV light radiation barrier. Film composite of chitosan?TiO2 AR was biodegradable with longer degradation time (28 days) compared to chitosan?glycerol films (25 days).

Kata Kunci : film, komposit, kitosan, TiO2