PROCESS FOR PREPARATION OF ENVIRONMENTALLY DEGRADABLE POLYMERIC BLENDS ENHANCED WITH NANOCRYSTALS / NANOWHISKERS OF CELLULOSE FOR PRODUCTION OF FLEXIBLE FILMS BY EXTRUSION

摘要

process of preparing environmentally degradable polymer blends reinforced with cellulose nanocrystals / nanowhiskers for the production of flexible extrusion films. The present invention relates to a polymeric blend for preparing environmentally degradable materials, said blend being comprised of biodegradable polymers, cassava starch and / or starches from other sources, and pbat, an aliphatic-aromatic copolyester - poly (adipate-co). butylene terephthalate), in addition to purified glycerin or glycerol, stearic and citric acids, and at least one reinforcing additive such as cellulose nanocrystals / nanowhiskers. The present invention further relates to the process of obtaining said blend. a first polymer (starch) and a portion of a nanocharge (cellulose nanocrystals), plus additives such as plasticizers and processing agents, are provided and mixed in a progressive melt kneading apparatus (twin screw extruder). the first now nanocrystallized / nanowhisker additive polymer (atp nwc) and the second pbat polymer in the proportions 20-70 / 80-30 (m / m), respectively, are mixed and processed in a twin screw extruder to obtain an adequate morphology in the distribution, dispersion and interaction of the polymers, so that polymeric blends with properties superior to pure biodegradable polymers are obtained, allowing the granules of the polymeric blends produced to be used for the manufacture of products such as flexible films through techniques. as extrusion (single and / or double screw).