ABSTRACT
Heat shrink polymers have shrinkage properties (they can change dimensions when subjected to the action of heat). So heat-shrinkable polymers are part of the shape memory polymers that result from heat stimuli changing their shape. They are generally used to wrap products of different shapes and sizes. Their sealing strength, as well as their resistance to breakage, makes them innovative and indispensable. Heat shrinkable polymers can be modeled as a two-component system. They possess crystalline and amorphous regions and are always cross-linked to enhance their warmth shrinkage. The amorphous polymer chains represent the elastic component, and the crystalline regions represent a reversible transition component. Therefore, the main characteristic of a heat-shrinkable biodegradables polymer should be the decomposition capacity carried out by microorganisms found naturally in nature, such as bacteria, fungi and algae, and in this way be assimilated entirely, without leaving residues in the natural environment in a specific period.
