Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/70662
Type: Artigo de periódico
Title: Poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)]/layered double hydroxide nanocomposites
Author: Dagnon, KL
Chen, HH
Lnnocentini-Mei, LH
D'Souza, NA
Abstract: BACKGROUND: The thermomechanical performance of poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)] (PHBV) is associated with its crystallization. Enhanced nucleation using a stearate-functionalized synthetic layered double hydroxide (LDH) presents a potential solution. RESULTS: PHBV crystallization varied with concentration of LDH. At lower LDH concentration, thermal history-induced cold crystallization was present. The extent of this order-disorder transition decreased with increasing LDH concentration and was completely eliminated at 7 wt% LOH. PHBV did not have a melt recrystallization peak but the introduction of LDH resulted in an increasingly pronounced melt recrystallization with increasing LDH concentration. Polarized optical microscopy coupled with differential scanning calorimetry and wide angle X-ray diffraction (WAXD) analysis indicated increased lamella thickness in the nanocomposites compared to pure PHBV. WAXD and transmission electron microscopy showed that the nanocomposites had an intercalated but aggregated dispersion. CONCLUSION: The concentration of nanofiller provides unique effects in PHBV. Mechanical performance was found to scale with composition as determined using dynamic mechanical analysis and tensile testing. (C) 2008 Society of Chemical Industry
Subject: poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)]
layered double hydroxides
crystallization
polarized optical microscopy
thermal analysis
nanocomposites
Country: Inglaterra
Editor: John Wiley & Sons Ltd
Rights: fechado
Identifier DOI: 10.1002/pi.2503
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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