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International Journal of Polymer Science
Volume 2017 (2017), Article ID 9316761, 9 pages
https://doi.org/10.1155/2017/9316761
Research Article

Effect of Graphite Nanosheets on Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

1Institute of Science and Technology, Federal University of São Paulo (UNIFESP), Group of Polymers and Macromolecules, São José dos Campos, SP, Brazil
2National Institute for Space Research (INPE), Associated Laboratory of Sensors and Materials (LAS), São José dos Campos, SP, Brazil

Correspondence should be addressed to Larissa Stieven Montagna; rb.moc.oohay@latneibmassiral

Received 24 January 2017; Revised 27 March 2017; Accepted 5 April 2017; Published 3 May 2017

Academic Editor: Marta Fernández-García

Copyright © 2017 Larissa Stieven Montagna 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 influence of different contents, 0.25, 0.50, and 1.00 wt%, of graphite nanosheets (GNS) on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanocomposites obtained by solution casting method has been studied. GNS were prepared by three steps: intercalation (chemical exfoliation), expansion (thermal treatment), and the GNS obtainment (physical treatment by ultrasonic exfoliation). X-ray diffraction (XRD), Raman spectroscopy, and field emission gun-scanning electron microscopy (FE-SEM) showed that the physical, chemical, and thermal treatments preserved the graphite sheets structure. XRD and Raman results also showed that GNS were dispersed in the PHBV matrix. The degree of crystallinity (X) of the nanocomposites did not change when the graphite nanosheets were added. However, the GNS acted as nucleation agent for crystallization; that is, in the second heating the samples containing GNS showed two melting peaks. The addition the GNS did not change the thermal stability of the PHBV.