Estudo da compatibilização de compósitos de polipropileno e farinha de madeira com polipropileno enxertado com ácido acrílico e anidrido maleico

Abstract

The use of polymeric mixtures has been extensively studied and has great prominence on account of obtaining a material with modified properties from others pre-existing. The polymer composites filled with wood or other natural fibers are a major attraction for presenting a number of advantages over inorganic fillers, for example, low density, and are derived from renewable sources. However, additional efforts are made to improve the interfacial adhesion between these components, because of the lack of compatibility between the wood, a highly polar substance, and polymer materials, nonpolar or with relatively low polarity. The objective of this work was to study the properties of polypropylene composites, both virgin (01 extrusion) and recycled (02 extrusions), using wood flour as reinforcements, compatible with polypropylene-co-acrylic acid (PP-g-AA) and polypropylene-co-maleic anhydride (PP-g-MA), at different concentrations. The materials were mixed in a twin-screw extruder and the characterizations were performed by means of infrared spectroscopy (FTIR), paralell plate rheology, impact tests, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). This last technique was used to study isothermal and non-isothermal crystallization kinetics