Brucite nanoplates reinforced starch bionanocomposites

Autor(es)

Moreira, Francys K. V. ^{[1, 2]} ; Pedro, Daniel C. A. ^{[1, 3]} ; Glenn, Gregory M. ^[4] ; Marconcini, Jose M. ^[1] ; Mattoso, Luiz H. C. ^[1]

Afiliação do(s) autor(es)

^[1] Embrapa Instrumentacao CNPDIA, LNNA, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat PPG CEM, BR-13560 Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Engn Mat DEMA, BR-13560 Sao Carlos, SP - Brazil

^[4] ARS, Western Reg Res Ctr WRRC, USDA, Albany, CA - USA

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 92, n. 2, p. 1743-1751, FEB 15 2013.
• Citações Web of Science: 22

Resumo

In this paper the mechanical reinforcement of nano-sized brucite, Mg(OH)(2) in a series of bionanocomposite films based on starch was investigated. Brucite nanoplates with an aspect ratio of 9.25 were synthesized by wet precipitation and incorporated into starch matrices at different concentrations (0-7.5 wt.%). Scanning electron microscopy revealed a high degree of nanoplate dispersion within the starch bionanocomposites and good interfacial adhesion between the filler and matrix. The brucite nanoplates formed agglomerates at high concentrations. The reinforcement factor values of the bionanocomposites were higher than the values predicted from the Halphin-Tsai model, which was attributed mainly to the high surface area of the nanoplates. Brucite (1 wt.%) nearly doubled the elastic modulus of starch films. Thermogravimetric analyses indicated some interaction between starch and the brucite that modified their decomposition profiles. Mechanical tests of glycerol plasticized bionanocomposites showed that the reinforcing efficiency of brucite remained high even at 10 wt.% and 20 wt.% of plasticizer. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/11584-5 - Desenvolvimento de nanocompósitos poliméricos biodegradáveis a partir de pectina, amido e hidróxidos duplos lamelares
• Beneficiário: Francys Kley Vieira Moreira
• Modalidade de apoio: Bolsas no Brasil - Doutorado