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The development of new materials has been occurring in order to obtain solutions environmentally more effective. In this context, natural fibers have been used as reinforcement in polymer matrix composites, since they present low density and biodegradability. In the present work Imperata brasiliensis grass was chemically treated by acetosolv treatment using a solution of acetic acid 93 wt% at 110 °C, under reflux, using hydrochloric acid solution 0.3 wt% as catalyst, and bleached with a 1:1 solution of NaOH 4% (w/v) and H2O2 30% (v/v) at 70 °C for 3 h. Untreated and treated fibers were characterized by thermogravimetric analysis (TGA/DTG) and scanning electron microscopy (SEM) and also the color changes after each chemical treatment were considered. According to the results of TGA, the thermal stability of the fiber has increased, comparing untreated and bleached fibers. TGA results also showed the removal of some peaks which is related to the removal of amorphous constituents, a consequence that was also observed trough color analysis. Furthermore, SEM micrographs indicates a defibrillation of fiber after each chemical treatment, a result that can upgrade the anchorage between fiber and matrix and increase subsequent properties of the composite. Key-words: Natural fibers. Composites. Imperata brasiliensis. Acetosolv. Bleaching

EFFECT OF CHEMICAL TREATMENTS ON THERMAL PROPERTIES OF IMPERATA BRASILIENSIS GRASS TO REINFORCE COMPOSITES WITH POLYMERIC MATRIX