Poly(lactic acid)/TiO2 nanocomposites as alternative biocidal and antifungal materials
Author
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Fonseca, Carmen
Author
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Ochoa, Almudena
Author
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Ulloa Flores, María Teresa
Author
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Álvarez Duarte, Eduardo
Author
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Canales, Daniel
Author
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Zapata, Paul A.
Admission date
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2015-12-13T19:48:39Z
Available date
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2015-12-13T19:48:39Z
Publication date
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2015
Cita de ítem
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Materials Science and Engineering C 57 (2015) 314–320
en_US
Identifier
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DOI: 10.1016/j.msec.2015.07.069
Identifier
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https://repositorio.uchile.cl/handle/2250/135666
General note
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Artículo de publicación ISI
en_US
Abstract
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Poly(lactic acid) (PLA) composites with titanium oxide (TiO2) similar to 10-nm nanoparticles were produced by the melting process and their main properties were evaluated. The nanoparticles are homogeneously dispersed in the matrix with a low degree of agglomeration, as seen by transmission electron microscopy (TEM). The crystallinity temperature increased similar to 12% when 5 wt.% of TiO2 was added, showing that the nanoparticles acted as nucleating agents this trend was confirmed by optical images. The elastic modulus increased similar to 54% compared to neat PIA at 5 wt.% of nanoparticles. Despite these improvements, PLA/TiO2 nanocomposites showed lower shear viscosity than neat PIA, possibly reflecting degradation of the polymer due to the particles. Regarding biocidal properties, after 2 h of contact the PLA/TiO2 composites with 8 wt% TiO2 showed a reduction of Escherichia colt colonies of similar to 82% under no UVA irradiation compared to pure PIA This biocidal characteristic can be increased under UVA irradiation, with nanocomposites containing 8 wt.%TiO2 killing 94% of the bacteria. The PLA/TiO2 nanocomposites with 8 wt.% were also 99.99% effective against Aspergillus fumigatus under the UVA irradiation.