Traditional flexible packaging films or multilayer packaging (including a polymeric film) is generally not easy to be recycled. For these applications the production of biodegradable flexible films can be an important alternative. Poly(lactic acid) (PLA) is one of the promising polymers for such applications, because it comes from renewable sources and it is biodegradable, but, on the point of view of mechanical properties, it is rigid and brittle. It is necessary to blend it with other polymers1, such as poly(butylene adipate-co-terephthalate) (PBAT) or poly(butylene succinate) (PBS), or plasticizers2 to achieve a good balance of properties for producing flexible films3. Moreover, the addition of nucleating agents can be useful to controlling both processability and final properties4. In this work extruded PLA blends containing PBAT or PBS were employed for producing film by blown extrusion in the presence of a reactive plasticizer and a nucleating agent in order to modulate the final properties of films, in particular the tear resistance.
Tearing resistance of blown biodegradable films based on PLA
MALLEGNI, NORMA;COLTELLI, MARIA BEATRICE;CINELLI, PATRIZIA;LAZZERI, ANDREA
2016-01-01
Abstract
Traditional flexible packaging films or multilayer packaging (including a polymeric film) is generally not easy to be recycled. For these applications the production of biodegradable flexible films can be an important alternative. Poly(lactic acid) (PLA) is one of the promising polymers for such applications, because it comes from renewable sources and it is biodegradable, but, on the point of view of mechanical properties, it is rigid and brittle. It is necessary to blend it with other polymers1, such as poly(butylene adipate-co-terephthalate) (PBAT) or poly(butylene succinate) (PBS), or plasticizers2 to achieve a good balance of properties for producing flexible films3. Moreover, the addition of nucleating agents can be useful to controlling both processability and final properties4. In this work extruded PLA blends containing PBAT or PBS were employed for producing film by blown extrusion in the presence of a reactive plasticizer and a nucleating agent in order to modulate the final properties of films, in particular the tear resistance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.