Journal
GREEN CHEMISTRY
Volume 18, Issue 6, Pages 1571-1580Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5gc02231b
Keywords
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Funding
- European Union (FEDER)
- National funds from the National Strategic Reference Framework Portugal (QREN) allocated through the Operational Competitiveness Program (COMPETE)
- North Portugal Regional Operational Program (ON.2) [FCOMP-01-0124-FEDER-37285, FCOMP-01-0124-FEDER-041438, NORTE-07-0124-FEDER-000069, NORTE-07-0124-FEDER-000037]
- I3N through the Portuguese Foundation for Science and Technology (FCT) [UID/QUI/50006/2013, PEst-C/CTM/LA0025/2011, EXPL/QEQ-QFI/0368/2013]
- Fundação para a Ciência e a Tecnologia [EXPL/QEQ-QFI/0368/2013] Funding Source: FCT
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A eutectic mixture of choline chloride (ChCl) and citric acid (CA) was successfully used for the preparation of chitosan (Chit) bio-films by thermo-compression molding. Optimization of the film preparation conditions was carried out using response surface methodology and a Box-Behnken design based on the best mechanical properties and lowest energetic requirements (lower compression load and time). The optimum film, made with chitosan and ChCl-CA (eutectic mixture), was compared with films prepared using only CA in their formulation. Chit-ChCl-CA films presented higher elasticity, opacity and total color difference, and a lower tensile strength in relation to the Chit-CA films. Films prepared with the eutectic mixture presented higher water vapor permeability values. These results were associated with the films microstructures. FTIR analysis confirms the occurrence of chemical changes in the processed films. The thermo-compression process significantly affects the crystallinity of the pristine chitosan. The films thermal stability is depressed when compared to the stability of each component.
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