Misturas de PEAD/quitosana: morfologia e caracterização térmica e mecânica

Abstract

This research have the aim of prepare mixture of high density polyethylene (HDPE) and chitosan (CS) with and without compatibilizers agents. To this, have developed in laboratory, powders by two different methods, precipitation and evaporation. It was used like compatibilizers agents on mixture HDPE/CS. They are chemically modified chitosan with the ammonium alkil organic salt codified as (CS+MA)evap, (CS+MA)prec and the chemically modified clay AN with the respectives samples codified as AN(CS+MA)evap e AN(CS+MA)prec. Next, the HDPE/CS mixture with different proportion 90/10, 80/20, 70/30 and 60/40 in weight fractions with and without compatibilizers, respectively was prepared by internal mixer torque rheometry Haake, operating at 170°C, 60 rpm for 10 min. Every samples was analysed morphologically, thermically and mechanically. Was observed in the differents compositions of MIXTURE that when we decrease the chitosan proportion of the mixture HDPE/CS we have a discrete increase on the crystallinity percentage and an increase on the thermal stability. The FTIR results pointing to absence on interation between both components of mistute HDPE/CS, indicating immiscibility of mixture the obtained analyses by MEV of the fracture surface of mixture 80/20 HDPE/CS for different compositions showing a weak interfacial adhesion. However, the addiction of compatibilizer agent, specially the chemically modified clay AN(CS+MA)prec resulted in greater tendency in the interaction between the components HDPE/CS as consequence of better dispersion of chitosan on HDPE.