Polymers are a series of viscoelastic materials. The structural and mechanical characterizations are important tools and a good example of introducing the measurement of the physical properties of industrial polymers into the research field of biodegradable polymers. Edible films or biodegradable films have a wide application in the industry market for their specified thermal and mechanical properties. Heating amorphous thermoplastic agro-polymers above the glass transition temperature, produces soft and rubbery materials, and may permit their incorporation into specific products such as packaging materials. Cooling to room temperature can reconvert rubbery products to glassy materials, giving more or less rigid forms with the desired structure