ELABORATION AND CHARACTERIZATION OF A NATURAL COMPOSITE MATERIAL BASED ON COLLOIDAL PARTICLES OF MICROCRYSTALLINE CELLULOSE COATED WITH MODIFIED STARCH

摘要

Physicochemical and rheological analyses were realized on microcrystalline cellulose (MCC) of colloidal grade, coated with octenyl succinic anhydride (OSA) starch. The objective was to prepare a biobased material (OSA-Cel), with new characteristics relating to both surface activity and viscosity. The chemical structures of MCC, OSA-starch and OSA-Cel were studied using FT-IR and XRD analyses, and their surface aspects were determined by surface tension measurements. From the results obtained, it was noticed that the FT-IR spectra showed great similarity between the characteristics of the crude MCC and those of OSA-Cel. Analysis by XRD showed a peak that was attributed to the crystalline phase of the cellulose. Furthermore, it was shown that OSA-starch interacts notably with MCC. The rheological properties at different concentrations of OSA-Cel showed the same behavior as that of MCC, a three-region viscosity profile (thinning, shear thickening and an infinite shear plateau).