Influence of Incorporation of Starch Nanoparticles in PBAT/TPS Films

PAULA GONZÁLEZ SELIGRA; LIDIA ELOY MOURA; LUCÍA FAMÁ; JANICE DRUZIAN; SILVIA GOYANES

POLYMER INTERNATIONAL

JOHN WILEY & SONS LTD

Año: 2016 vol. 65 p. 938 - 945

0959-8103

Films of PBAT/TPS (poly(butylene adipate-co-terephthalate)/thermoplastic starch) (starch plasticized with glycerol containingcitric and stearic acids) without and with 0.6wt% starch nanoparticles were AQ2 produced by extrusion. The presence ofnanoparticles during the extrusion process led to a higher degree of starch gelatinization improving starch compatibility withPBAT.Nanoparticles modified the interaction between the different components of the PBAT/TPS composite. The hydroxylgroups of the starch nanoparticles interacted with starch amylose by means of hydrogen bonds. In addition, nanoparticles modifiedthe structure of the PBAT rigid segment (BT): a shift of Tm of BT toward lower temperatures anda slight shift of the relaxationof the BT segment to higher temperatures were observed. The incorporation of nanoparticles also had a reinforcing effect onthe PBAT/TPS matrix. The composite presented slight increases of Young?s modulus (E) and stress at break (𝝈b)without affectingthe strain at break (𝜺b). The rate of biodegradability was improved with the use of starch nanoparticles. The composite showedfaster deterioration than the matrix, showing the first changes in its tonality and breakdowns at only 6 days of burial in compost.© 2016 Society of Chemical Industry