Biodegradation Evaluation of Composites with Natural Fiber by Weight Loss and CO2 Production

The biodegradable polymers pass by a degradation process resulting from action of microorganisms such as bacteria, fungi and algae. These polymers are being used as matrix in the composites obtained with natural fibers seeking to improve the mechanical and thermal properties without amending the biodegradability characteristics of the product. Thus, this study evaluated the biodegradation of composites obtained from commercial blends of poly ( butylene adipate-coterephthalic) (PBAT) and starch as matrix and rice husk (CA) using two different techniques. PBAT starch systems with 10, 20 and 30% RH were obtained in an internal mixer and evaluated by weight loss by biodegradation test in the simulated ground, using the Sturm test. The tests for weight loss indicates that the attack of microorganisms occurs preferentially in the matrix. However, the atmosphere used in the Sturm test to evaluate the degradation was favorable biodegradation of samples of rice husk.