Author | dc.contributor.author | Fonseca, Carmen | |
Author | dc.contributor.author | Ochoa, Almudena | |
Author | dc.contributor.author | Ulloa, Maria Teresa | |
Author | dc.contributor.author | Alvarez, Eduardo | |
Author | dc.contributor.author | Canales, Daniel | |
Author | dc.contributor.author | Zapata, Paula | |
Admission date | dc.date.accessioned | 2018-12-20T15:24:49Z | |
Available date | dc.date.available | 2018-12-20T15:24:49Z | |
Publication date | dc.date.issued | 2015 | |
Cita de ítem | dc.identifier.citation | Materials Science and Engineering C, Volumen 57, 2015, Pages 314-320. | |
Identifier | dc.identifier.issn | 09284931 | |
Identifier | dc.identifier.other | 10.1016/j.msec.2015.07.069 | |
Identifier | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/159117 | |
Abstract | dc.description.abstract | Poly(lactic acid) (PLA) composites with titanium oxide (TiO2) ~ 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 ~ 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 ~ 54% compared to neat PLA at 5 wt.% of nanoparticles. Despite these improvements, PLA/TiO2 nanocomposites showed lower shear viscosity than neat PLA, 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 coli colonies of ~ 82% under no UVA irradiation compared to pure PLA. 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. - Highlights: • PLA composites with titanium oxide (10 nm) were produced by the melting process. • The crystallinity temperature increased ~ 12% when 5 wt.% of TiO2 was added. • The elastic modulus increased ~ 54% compared to neat PLA. • The PLA/TiO2 composites showed a reduction of Escherichia coli colonies of 94%. • The PLA/TiO2 nanocomposites with 8 wt.% were also 99.99% effective against fungi. | |
Lenguage | dc.language.iso | en | |
Publisher | dc.publisher | Elsevier Ltd | |
Source | dc.source | Materials Science and Engineering C | |
Keywords | dc.subject | Mechanical properties | |
Keywords | dc.subject | Nano particles | |
Keywords | dc.subject | Nanocomposites | |
Keywords | dc.subject | Polymer matrix composites (PMCs) | |
Keywords | dc.subject | Thermal properties | |
Título | dc.title | Poly(lactic acid)/TiO | |
Document type | dc.type | Artículo de revista | |
dcterms.accessRights | dcterms.accessRights | Acceso a solo metadatos | |
Cataloguer | uchile.catalogador | jmm | |
Indexation | uchile.index | Artículo de publicación SCOPUS | |
uchile.cosecha | uchile.cosecha | SI | |