Please use this identifier to cite or link to this item: https://hdl.handle.net/1822/31222

TitleHomogeneous poly (L-lactic acid)/chitosan blended films
Author(s)Ferreira, C. S.
Caridade, S. G.
Mano, J. F.
Alves, N. M.
KeywordsBiomaterials
Blends
Chitosan
Polylactides
Issue date2014
PublisherJohn Wiley and Sons
JournalPolymers for Advanced Technologies
CitationFerreira, C. S., Caridade, S. G., Mano, J. F., & Alves, N. M. (2014). Homogeneous poly(L-lactic acid)/chitosan blended films. Polymers for Advanced Technologies. doi: 10.1002/pat.3391
Abstract(s)This work reports an optimized and simple methodology for the preparation of poly(L-lactic) acid/chitosan (CHT) blends by solvent casting based on the use of a common solvent: hexafluor-2-propanol. Films with different component fractions were successfully prepared and did not show visible phase separation. Such biodegradable films have potential to be used in distinct biomedical and environmental applications. The composition effect on film wettability and morphology was investigated by contact angle measurements and scanning electron microscopy. Swelling measurements were also conducted. The composition effect on their thermal properties was analyzed by differential scanning calorimetry. It was found that crystallization is almost suppressed for CHT fractions above 50%. The film miscibility as a function of their composition was evaluated by optical microscopy and Fourier transform infrared spectroscopy imaging. These results evidenced the good miscibility at the microscopic level of the blends. The viscoelastic behavior of the developed films was also studied for the first time by dynamical mechanical analysis (DMA) in an unconventional way: their mechanical properties were measured while they were immersed in gradient compositions of water/ethanol mixtures. This allowed to analyze the glass transition dynamics of the CHT fraction, which would not be possible with conventional DMA tests. DMA temperature scans were also conducted.
TypeArticle
URIhttps://hdl.handle.net/1822/31222
DOI10.1002/pat.3391
ISSN1099-1581
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:3B’s - Artigos em revistas/Papers in scientific journals

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