Journal
POLYMER INTERNATIONAL
Volume 62, Issue 1, Pages 33-40Publisher
WILEY
DOI: 10.1002/pi.4290
Keywords
polymer-matrix composites (PMCs); Raman spectroscopy; TEM; SEM; DSC; solvent casting
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Funding
- FCT (Foundation for Science and Technology) [PTDC/EME-PME/114808/2009]
- FCT (Fundacao para a Ciencia e Tecnologia) [SFRH/BPD/64735/2009]
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Nanocomposite thin films of poly(lactic acid) (PLA) were produced incorporating small amounts (0.2 to 1 wt%) of graphene oxide (GO) and graphene nanoplatelets (GNP). The films were prepared by solvent-casting. Mechanical properties were evaluated for plasticized (by residual solvent) and unplasticized films. Plasticized nanocomposite films presented yield strength and Young's modulus about 100% higher than those of pristine PLA. For unplasticized films improvements in tensile strength and Young's modulus were about 15 and 85%, respectively. For both film types, a maximum in mechanical performance was identified for about 0.4 wt% loadings of the two filler materials tested. Permeabilities towards oxygen and nitrogen decreased, respectively, three-and fourfold in films loaded with both GO or GNP. The glass transition temperature showed maximum increases, in relation to unloaded PLA films, of 5 degrees C for 0.4 wt% GO and 7 degrees C for 0.4 wt% GNP, coinciding with the observed maxima in mechanical properties. (C) 2012 Society of Chemical Industry
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