Characterization of Hydrolytic Degradation of Polylactic acid/Rice Hulls Composites in Water at Different Temperatures

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dc.contributor.authorNdazi, Bwire S.
dc.contributor.authorKarlssion, S.
dc.date.accessioned2016-03-11T11:05:41Z
dc.date.available2016-03-11T11:05:41Z
dc.date.issued2011
dc.description.abstract. Hydrolytic degradations of polylactic acid/rice hulls (PLA/RH) composites with various rice hulls contents due to water absorptions at 23, 51 and 69°C were investigated by studying the thermal properties, chemical composition, molecular weight, and morphology of the degraded products. The results have attested that the stability of PLA/RH composites in water depends slightly on rice hulls contents but it is significantly influenced by water temperature. Water absorption in 30 days at 23°C was between 0.87 and 9.25% depending on rice hull contents. However, at thermophilic temperatures, the water absorption and degradation of these products were increased significantly. Saturations were achieved in less than 25 and 9 days at 51°C and 69°C, respectively, while hydrolytic degradation was demonstrated by an increase in fragility and development of crystallinity. At 69°C, there were significant reductions of the decomposition and glass transition temperatures of the polymer by 13°C. These changes were associated with the reduction of the molecular weight of PLA from 153.1 kDa to !10.7 kDa due to hydrolysis of its ester group.en_US
dc.identifier.citationNdazi, B.S. and Karlsson, S., 2011. Characterization of hydrolytic degradation of polylactic acid/rice hulls composites in water at different temperatures. Express Polym Lett, 5, pp.119-131.en_US
dc.identifier.doi10.3144/expresspolymlett.2011.13
dc.identifier.urihttp://hdl.handle.net/123456789/868
dc.language.isoenen_US
dc.publisherExpress Polym Letten_US
dc.subjectbiodegradable polymersen_US
dc.subjectpolylactic aciden_US
dc.subjectrice hullsen_US
dc.subjecthydrolytic degradationen_US
dc.subjectmolecular weighten_US
dc.titleCharacterization of Hydrolytic Degradation of Polylactic acid/Rice Hulls Composites in Water at Different Temperaturesen_US
dc.typeJournal Articleen_US
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