<p>The development of environmentally friendly packaging materials is a globally significant issue due to the environmental problems caused by high production, excessive use, and improper disposal of synthetic plastics. Therefore, this study focuses on developing films based on natural polymers, such as starch and chitosan, and assessing the effects of adding different triblock copolymers on their physicochemical properties. The films were developed using the casting method, and their thermal, water adsorption, and wettability properties, as well as their biodegradability in water and compost, were examined at the laboratory level. Translucent, manageable films were obtained, with a thickness range of 53 to 127&#xa0;μm. The results indicate that all formulated films display a mainly hydrophilic nature, with contact angles between 18° and 44°, and a swelling index from 49% to 65%. Films with triblock copolymers of molecular weight less than 3000&#xa0;g/mol showed a lower water vapor absorption capacity (19%) under high relative humidity conditions (90%). According to FTIR and XRD analyses, using different triblock copolymers prevented starch retrogradation. However, they did not negatively impact the biodegradation process of these materials, as biodegradation in liquid water ranged from 36% to 40%, and reached 100% in compost at the laboratory level at 70 days. The study results show that adding different triblock copolymers or Pluronics to the starch/chitosan matrix enhances the functional properties of the films without impacting the biodegradation process. Therefore, incorporating uncommon additives like triblock copolymers into packaging material formulations is a feasible option for creating new materials.</p> Graphical abstract <p></p>