*Article* **Effects of Poloxamer Content and Storage Time of Biodegradable Starch-Chitosan Films on Its Thermal, Structural, Mechanical, and Morphological Properties**

**Abril Fonseca-García 1,2, Carolina Caicedo <sup>3</sup> , Enrique Javier Jiménez-Regalado <sup>1</sup> , Graciela Morales <sup>1</sup> and Rocio Yaneli Aguirre-Loredo 1,2,\***


**Abstract:** Biodegradable packaging prepared from starch is an alternative to fossil-based plastic packaging. However, the properties of starch packaging do not comply with the necessary physicochemical properties to preserve food. Hence, in a previous study, we reported the preparation of a composite polymer material based on starch-chitosan-pluronic F127 that was found to be an adequate alternative packaging material. In this study, we modified the physicochemical properties of this material by storing it for 16 months under ambient conditions. The results indicate that the incorporation of pluronic F127 in the blend polymer can help avoid the retrogradation of starch. Moreover, at higher concentrations of pluronic F127, wettability is reduced. Finally, after storage, the materials exhibited surface modification, which is related to a color change and an increase in solubility, as well as a slight increase in stiffness.

**Keywords:** biodegradable packaging; biopolymer; starch; storage conditions; thermal properties; physicochemical properties
