Degradation of l-polylactide during melt processing with layered double hydroxides

Publication: Research - peer-reviewConference article – Annual report year: 2012

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PLA was melt compounded in small-scale batches with two forms of laurate-modified magnesium–aluminum layered double hydroxide (Mg-Al-LDH-C12), the corresponding carbonate form (Mg-Al-LDH-CO3) and a series of other additives. Various methods were then adopted to characterize the resulting compounds in an effort to gain greater insights into PLA degradation during melt processing. PLA molecular weight reduction was found to vary according to the type of LDH additive. It is considered that the degree of particle dispersion and LDH exfoliation, and hence the accessibility of the hydroxide layer surfaces and catalytically active Mg site centers are causative factors for PLA degradation. Interestingly, the release of water under the processing conditions was found to have a rather small effect on the PLA degradation. Low loadings of sodium laurate also caused PLA degradation indicating that carboxylate chain ends may be active degrading agents. Phosphate treatment of laurate-modified LDH was investigated and this may be a promising way of reducing PLA degradation, thereby making such processes more practically realistic.

Original languageEnglish
JournalPolymer Degradation and Stability
Publication date2012
Volume97
Issue10
Pages2002-2009
ISSN0141-3910
DOIs
StatePublished

Conference

Conference3rd International Conference on Biodegradable and Biobased Polymers (BIOPOL 2011)
Number3
CountryFrance
CityStrasbourg
Period29/08/1131/08/11
Internet addresshttp://biopol.unistra.fr/
CitationsWeb of Science® Times Cited: 3

Keywords

  • LDH, PLA, Degradation, Additive, Catalytic depolymerization
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