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

Autor(es)

Braga, Natalia F. ^[1] ; da Silva, Ana Paula ^[1] ; Arantes, Tatiane Moraes ^[2] ; Lemes, Ana Paula ^[1] ; Cristovan, Fernando Henrique ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Paulo UNIFESP, Dept Sci & Technol, BR-12231280 Sao Jose Dos Campos, SP - Brazil

^[2] Fed Univ Goias UFG, Dept Chem, BR-75801615 Jatai, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH EXPRESS; v. 5, n. 1 JAN 2018.
• Citações Web of Science: 4

Resumo

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. (AU)

• Processo FAPESP: 13/14954-6 - Preparação e caracterização de nanocompósitos estruturais de polímeros biocompatíveis com nanopartículas de TiO2 para o emprego em Engenharia Tecidual
• Beneficiário: Natália Ferreira Braga
• Modalidade de apoio: Bolsas no Brasil - Mestrado