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Effect of MWCNT functionalization on thermal and electrical properties of PHBV/MWCNT nanocomposites

Published online by Cambridge University Press:  04 November 2014

Thaís Larissa do Amaral Montanheiro*
Affiliation:
Universidade Federal de São Paulo (UNIFESP), Instituto de Ciência e Tecnologia, São José dos Campos, São Paulo 12.231-280, Brazil
Fernando Henrique Cristóvan
Affiliation:
Universidade Federal de São Paulo (UNIFESP), Instituto de Ciência e Tecnologia, São José dos Campos, São Paulo 12.231-280, Brazil
João Paulo Barros Machado
Affiliation:
Instituto Nacional de Pesquisas Espaciais (INPE), Laboratório Associado de Sensores e Materiais (LAS), São José dos Campos, São Paulo 12.245-970, Brazil
Dayane Batista Tada
Affiliation:
Universidade Federal de São Paulo (UNIFESP), Instituto de Ciência e Tecnologia, São José dos Campos, São Paulo 12.231-280, Brazil
Nelson Durán
Affiliation:
Universidade Estadual de Campinas (UNICAMP), Instituto de Química, Campinas,São Paulo 13.083-970, Brazil; and Universidade Estadual de Campinas (UNICAMP), Laboratory on Nanostructures Synthesis and Biological Interactions (NanoBioss), Campinas, São Paulo 13.083-970, Brazil
Ana Paula Lemes
Affiliation:
Universidade Federal de São Paulo (UNIFESP), Instituto de Ciência e Tecnologia, São José dos Campos, São Paulo 12.231-280, Brazil; and Universidade Estadual de Campinas (UNICAMP), Instituto de Química, Campinas, São Paulo 13.083-970, Brazil
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Pristine multiwalled carbon nanotubes (P-MWCNTs) were functionalized with carboxylic groups (MWCNT-COOH) through oxidation reactions and then reduced to produce hydroxyl groups (MWCNT-OH). Pristine and functionalized MWCNTs were used to produce poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) nanocomposites with 0.5 wt% of MWCNTs. MWCNT functionalization was verified by visual stability in water, infrared and Raman spectroscopy, and zeta potential measurements. Pristine and functionalized MWCNTs acted as the nucleating agent in a PHBV matrix, as verified by differential scanning calorimetry (DSC). However, the dispersion of filler into the matrix, thermal stability, and direct current (DC) conductivity were affected by MWCNT functionalization. Scanning electron microscopy (SEM) showed that filler dispersion into the PHBV matrix was improved with MWCNT functionalization. The surface roughness was reduced with the addition and functionalization of MWCNT. The thermal stability of PHBV/MWCNT-COOH, PHBV/P-MWCNT, and PHBV/MWCNT-OH nanocomposites were 20, 30, and 30 °C higher than neat PHBV, respectively, as verified by thermogravimetry analysis (TGA). Addition of pristine and functionalized MWCNTs provided electrical conductivity in nanocomposite, which was higher for PHBV/P-MWCNTs (1.2 × 10−5 S cm−1).

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Articles
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Copyright © Materials Research Society 2015 

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