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

International Journal of Polymer Science - Tập 2017 - Trang 1-10 - 2017
Normane Mirele Chaves da Silva1, Paulo Romano Cruz Correia2, Janice Izabel Druzian2, Fádi Fakhouri3, Rosana Lopes Fialho1, Elaine C. Cabral1
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

Tóm tắt

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.

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International Journal of Polymer Science

Tập 2017

1-10

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