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• W2974778049 abstract "Abstract Biopolymer nanocomposites were prepared by solvent casting dispersing lauryl-functionalized cellulose nano-fibrils (CNF) in a poly(lactic acid) matrix (PLA). The release of residual chloroform (CHCl 3 ) solvent molecules was studied by Thermal Desorption Spectroscopy (TDS) analysis. TDS spectra of the PLA matrix show a single desorption peak at T P = 393 K with FWHM ~10 K, compatible with a zero-order desorption kinetics. This narrow TDS peak was accurately reproduced assuming that: (i) the rate limiting step is given by the CHCl 3 de-trapping from sites in the PLA matrix where residual solvent molecules form small aggregates and (ii) the activation energy for desorption linearly decreases from 1.19 eV for saturated traps to 1.11 eV when the traps occupancy by solvent molecules approaches zero. The balance energy term ϵ D = −0.08 eV is due to the attractive interactions between trapped CHCl 3 molecules. Adding CNF particles to the PLA matrix the zero-order peak shifts to lower temperatures and a second peak with FWHM ~60 K appears at higher temperatures. This second peak is compatible with a first-order desorption kinetics and is attributed to the release of dispersed CHCl 3 molecules from trapping sites in PLA-CNF interface region. The obtained information are of interest for applications in food and electronic packaging and for the development of medical materials." @default.
• W2974778049 created "2019-09-26" @default.
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• W2974778049 date "2019-09-14" @default.
• W2974778049 modified "2023-09-25" @default.
• W2974778049 title "Chloroform desorption from poly(lactic acid) nanocomposites: a thermal desorption spectroscopy study" @default.
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• W2974778049 doi "https://doi.org/10.1515/pac-2018-1216" @default.
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