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Morphology, molecular interactions and H 2 O diffusion in a poly(lactic-acid)/graphene composite: A vibrational spectroscopy study
- Source :
- Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, (2019). doi:10.1016/j.saa.2018.08.019, info:cnr-pdr/source/autori:P. Musto, P. La Manna, F. Cimino, G. Mensitieri, P. Russo/titolo:Morphology, Molecular Interactions and H2O Diffusion in a Poly(lactic-acid)%2FGraphene Composite: A Vibrational Spectroscopy Study/doi:10.1016%2Fj.saa.2018.08.019/rivista:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (Print)/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume
- Publication Year :
- 2019
-
Abstract
- A composite system made of poly( l -lactic acid) (PLLA) and graphene nanoplatelets (GNP) was investigated by Raman and FTIR spectroscopy. Two compositions were prepared and characterized in comparison to the pristine polymer: they contained, respectively, 0.25 and 0.75 wt% of the nanofiller. The study was focused on the morphological properties of the system, and, in particular, on the level of dispersion and the homogeneity obtainable with the adopted preparation protocol. Furthermore, the possible molecular interactions taking place between the nanofiller and the polymer matrix were considered. Both the above issues were investigated by confocal Raman spectroscopy, with the aid of first-principle calculations to strengthen the spectral interpretation. Finally, the effect of the nanofiller on water diffusion was investigated by time-resolved FTIR spectroscopy, which provided accurate equilibrium and kinetic data, as well as molecular level information on the penetrant-to-substrate interactions. It was found that, for a 0.25 wt% composition, the adopted preparation protocol allowed us to achieve a dispersion at the level of single nanoplatelets, while for a 0.75 wt% composition, the GNP's aggregate into a co-continuous phase. PLLA/GNP interactions were detected by Raman spectroscopy, producing a detectable perturbation of the PLLA conformational equilibrium. Both the diffusivities and the equilibrium water uptake were found to decrease significantly by increasing the filler content.
- Subjects :
- Atomic and Molecular Physics, and Optic
Composite number
Infrared spectroscopy
02 engineering and technology
Poly(lactic-acid)
010402 general chemistry
01 natural sciences
law.invention
Analytical Chemistry
Diffusion
symbols.namesake
chemistry.chemical_compound
law
Poly(lactic acid)
Homogeneity (physics)
Fourier transform infrared spectroscopy
Raman
Instrumentation
Spectroscopy
chemistry.chemical_classification
Graphene
Polymer
021001 nanoscience & nanotechnology
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Lactic acid
chemistry
Chemical engineering
FTIR
symbols
0210 nano-technology
Raman spectroscopy
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, (2019). doi:10.1016/j.saa.2018.08.019, info:cnr-pdr/source/autori:P. Musto, P. La Manna, F. Cimino, G. Mensitieri, P. Russo/titolo:Morphology, Molecular Interactions and H2O Diffusion in a Poly(lactic-acid)%2FGraphene Composite: A Vibrational Spectroscopy Study/doi:10.1016%2Fj.saa.2018.08.019/rivista:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (Print)/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume
- Accession number :
- edsair.doi.dedup.....7fe93d9ce49a3d26fef034c7246467db