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International Journal of Polymer Science
Volume 2017 (2017), Article ID 4308261, 10 pages
https://doi.org/10.1155/2017/4308261
Research Article

PBAT/TPS Composite Films Reinforced with Starch Nanoparticles Produced by Ultrasound

1Polytechnic School, Federal University of Bahia, Salvador, BA, Brazil
2Department of Bromatological Analysis, College of Pharmacy, Federal University of Bahia, Salvador, BA, Brazil
3Faculty of Engineering, Federal University of Grande Dourados, Dourados, MS, Brazil

Correspondence should be addressed to Normane Mirele Chaves da Silva; moc.oohay@sevahcenamron

Received 18 July 2017; Revised 3 November 2017; Accepted 13 November 2017; Published 11 December 2017

Academic Editor: Eliane Espuche

Copyright © 2017 Normane Mirele Chaves da Silva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The objective of the present work was to study the incorporation of starch nanoparticles (SNP) produced by ultrasound in blends of poly(butylene adipate-co-terephthalate) (PBAT) and thermoplastic starch (TPS). The films were produced by extrusion using varying percentages of SNP (1, 2, 3, 4, and 5% w/w). The SNP were prepared in water without the addition of any chemical reagent. The results revealed that ultrasound treatment results in the formation of SNP less than 100 nm in size and of an amorphous character and lower thermal stability and low gelatinization temperature when compared with cassava starch. Scanning electron microscopy (SEM) showed that films presented some starch granules. The relative crystallinity (RC) of films decreases with increasing concentration of SNP. The addition of SNP slightly affected the thermal degradation of the films. The DSC results showed that the addition did not modify the interaction between the different components of the films. Mechanical tests revealed an increase in Young’s modulus (36%) and elongation-at-break (35%) with the incorporation of 1% SNP and this concentration reduced the water vapor permeability (53%) and significantly decreased the water absorption of the films, demonstrating that low concentrations of SNP can be used as reinforcement in a polymeric matrix.