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The study reports on the preparation of nanocrystalline cellulose from waste papers (WPNCC), as an environmental friendly approach of source material and investigation of their effects on the morphological, mechanical and barrier properties of the Hydroxypropyl methylcellulose/Cationic starch (HPMC/CS) nanocomposites. HCl hydrolysis followed by alkali treatment and deinking of the bers resulted in the production of WPNCC. The TEM results con rmed the rod like shape of WPNCC; the average diameter was 22± 7 nanometers and the length was 125± 25 nanometers. The hydrolysis yield was 65% with high crystallinity index of 79.6%. The results of X-ray diffraction con rmed the successfully production of WPNCC and their effective presence in the HPMC/CS matrix. The homogeneity of WPNCC dispersion in the polymer matrix was approved by FESEM analysis. The WPNCC also did not affect the nanocomposites optical clarity. The optimum amount of 9 wt% WPNCC, showed the highest barrier, mechanical and biodegradablility properties. Statement Of NoveltyIn this study we worked on the production of cellulose nanocrystals from Waste Papers (as a recycled source to make an added value). This process (Waste Papers to NCC) has done by HCl hydrolysis for the rst time in order to have improved particles sizes and improved properties. Then we studied the effects of these produced nanocrystals on the fundamental properties and biodegradability of the Hydroxypropyl methylcellulose/Cationic Starch nanocomposites for the rst time.

The study reports on the preparation of nanocrystalline cellulose from waste papers (WPNCC), as an environmental friendly approach of source material and investigation of their effects on the morphological, mechanical and barrier properties of the Hydroxypropyl methylcellulose/Cationic starch (HPMC/CS) nanocomposites. HCl hydrolysis followed by alkali treatment and deinking of the fibers resulted in the production of WPNCC. The TEM results confirmed the rod like shape of WPNCC; the average diameter was 22± 7 nanometers and the length was 125± 25 nanometers. The hydrolysis yield was 65% with high crystallinity index of 79.6%. The results of X-ray diffraction confirmed the successfully production of WPNCC and their effective presence in the HPMC/CS matrix. The homogeneity of WPNCC dispersion in the polymer matrix was approved by FESEM analysis. The WPNCC also did not affect the nanocomposites optical clarity. The optimum amount of 9 wt% WPNCC, showed the highest barrier, mechanical and biodegradablility properties.