acid-grafted poly(butylene succinate adipate) (PBSA-g-AA) and agricultural residues (rice husk, RH) were
evaluated. Composites containing acrylic acid-grafted PBSA (PBSA-g-AA/RH) exhibited noticeably superior
mechanical properties compared with those of PBSA/RH due to greater compatibility with RH. The
dispersion of RH in the PBSA-g-AA matrix was highly homogeneous as a result of ester formation, and
the consequent creation of branched and cross-linked macromolecules, between the carboxyl groups of
PBSA-g-AA and hydroxyl groups in RH. Each composite was subject to biodegradation tests in an Azospirillum
brasilense BCRC 12270 liquid culture medium. The bacterium completely degraded both the
PBSA and the PBSA-g-AA/RH composite films. Morphological observations indicated severe disruption of
the film structure after 20e40 days of incubation. The PBSA-g-AA/RH (20 wt%) films were not only more
biodegradable than those made of PBSA but also exhibited lower molecular weight and intrinsic
viscosity, implying a strong connection between these characteristics and biodegradability.