Effect of organoclay incorporation on mechanical, barrier and thermal properties and anti-bacterial performance of PLA and PLA composites with triclosan and wood flour
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Author list: Prapruddivongs C., Sombatsompop N., Jayaraman K.
Publisher: SAGE Publications
Publication year: 2014
Journal: Polymers and Polymer Composites (0967-3911)
Volume number: 22
Issue number: 7
Start page: 643
End page: 652
Number of pages: 10
ISSN: 0967-3911
eISSN: 1478-2391
Languages: English-Great Britain (EN-GB)
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Abstract
Polylactic acid (PLA) is a biodegradable polymer which has a wide range of applications; in this work, all PLA based composites formulations were compounded by twin screw extruder and testing specimens were produced. This article focuses on determinations of mechanical, antibacterial, thermal and barrier properties of PLA composites. It was found that only the tensile modulus of PLA composites increased while the others decreased when 10% wood was loaded. The effect of Triclosan and Cloisiteฎ 30B compounding did not change the mechanical properties and glass transition temperature. However, by the presence of wood and Cloisiteฎ 30B, Tm values of the composites exhibited double peak characteristic which was related to an increase in crystallinity level. Antibacterial activity of the PLA composites was improved with the Cloisiteฎ 30B content, and this was attributed to cationic bactericide quaternary ammonium group between the silicates layers. Hydrophobic material Triclosan obviously changed water vapor permeability (WVP) of the PLA from 8.24 ื 10-11 to at 7.26 ื 10-11 g.mm/mm2.h.Pa for triclosan/PLA specimens. All PLA composites samples with 0.5% clay content showed a significant increase in oxygen barrier property. ฉ Smithers Information Ltd., 2014.
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