Poly I-lactide-layered double hydroxide nanocomposites via in situ polymerization of I-lactide

Vimal Katiyar, N. Gerds, C.B. Koch, J. Risbo, H.C.B. Hansen, David Plackett

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The use of clay nanofillers offers a potential route to improved barrier properties in polylactide films. Magnesium–aluminium layered double hydroxides (LDHs) are interesting in this respect and we therefore explored synthesis of PLA-LDH nanocomposites by ring-opening polymerization. This method is attractive because it should ensure good dispersion of LDH in the polymer. The effect of adding either LDH carbonate (LDH-CO3) or laurate-modified LDH (LDH-C12) was investigated. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy revealed that exfoliated nanocomposites were obtained when using LDH-C12 but that LDH-CO3 gave a partly phase-separated morphology. Thermogravimetric analysis showed that PLA-LDH combinations exhibited higher degradation onset temperatures and differential scanning calorimetry confirmed that LDHs can act as nucleating agents. However, PLA molecular weight was significantly reduced when in-situ polymerization was conducted in the presence of the LDHs and we suggest that chain termination via LDH surface hydroxyl groups and/or metal-catalyzed degradation could be responsible.
    Original languageEnglish
    JournalPolymer Degradation and Stability
    Volume95
    Issue number12
    Pages (from-to)2563-2573
    ISSN0141-3910
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Biopolymers
    • Solar energy

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