Synthesis and Characterization of Biopolymer Films: A Laboratory Activity for Teaching Sustainable Materials

Abstract

In recent years, the environmental impact of petroleum-based plastics used in the packaging industry has sparked innovation in bio-based materials. Given the essential role of higher education in tackling the global sustainability crisis, a laboratory activity was developed to integrate bio-based processes and products into the learning processes. This approach promotes learning grounded in sustainability principles and circular economy concepts. In this activity, bio-based films for food packaging applications were synthesized from commercial biomolecules of natural origin and characterized to analyze their physicochemical and mechanical properties through simple laboratory experiments (determination of color, thickness, opacity, moisture content, total soluble matter, swelling capacity, oil absorption and biodegradability) combined with advanced instrumental analysis (SEM, contact angle, tensile test). This laboratory project offers students the opportunity to engage with sustainable development while fostering competencies in critical thinking and problem-solving-based decision-making and strengthening skills in communication, collaboration, conflict management, and planning.