Physical-chemical properties of nanocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and titanium dioxide nanoparticles

Physical-chemical properties of nanocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and titanium dioxide nanoparticles

Author Braga, Natalia F. Autor UNIFESP Google Scholar
da Silva, Ana Paula Autor UNIFESP Google Scholar
Arantes, Tatiane Moraes Google Scholar
Lemes, Ana Paula Autor UNIFESP Google Scholar
Cristovan, Fernando Henrique Autor UNIFESP Google Scholar
Abstract Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was reinforced with titanium dioxide (TiO2) in concentrations of 1.0%, 2.5% and 5.0% (m/m) to produce nanocomposites by the solvent casting technique. TiO2 was synthesized by a hydrothermal treatment to produce nanoparticles. The nanostructure of the nanoparticles was studied by x-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The XRD confirmed TiO2 crystalline nanoparticles, with a mixture of anatase and rutile phases. Through TEM analysis, the formation of TiO2 nanorod agglomerates with an average diameter and length of 40 and 12 nm, respectively, was observed. The thermal and mechanical properties of the pure PHBV and nanocomposite films were characterized by differential scanning calorimetry (DSC) and dynamic mechanical analysis. The DSC analysis showed that the glass transition temperature decreased with the inclusion of TiO2 in the PHBV matrix in relation to pure PHBV. The results of biodegradation assays for the PHBV and nanocomposites in an aqueous medium and in soil showed morphological and structural changes for all samples, indicating a high biodegradation rate for this material. The most important conclusion is that the biodegradation of the PHBV was not affected by the addition of nanoparticles, thus enabling the use of nanocomposites in applications requiring biodegradable materials.
Keywords PHBV
titanium dioxide
nanoparticles
nanocomposites
physical-chemical properties
biodegradation
xmlui.dri2xhtml.METS-1.0.item-coverage Bristol
Language English
Sponsor CNPq
FAPESP [2013/14954-6]
Grant number FAPESP [2013/14954-6]
Date 2018
Published in Materials Research Express. Bristol, v. 5, n. 1, p. -, 2018.
ISSN 2053-1591 (Sherpa/Romeo, impact factor)
Publisher Iop Publishing Ltd
Extent -
Origin http://dx.doi.org/10.1088/2053-1591/aa9f7a
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000419326100003
URI https://repositorio.unifesp.br/handle/11600/53947

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