Moisture curable toughened poly(lactide) utilizing vinyltrimethoxysilane based crosslinks

J. Schneider, K. Bourque, R. Narayan

    Research output: Research - peer-reviewArticle

    Abstract

    Vinyltrimethoxysilane (VTMOS) was grafted on to the backbone of poly(lactide) (PLA) through a free radical grafting reaction using reactive extrusion (REX) processing. The methoxy groups of the silane provide the modified PLA sites for crosslinking through a moisture induced pathway. VTMOS grafting efficiencies of up to 90% were obtained. The newly created methoxy functionality of the modified PLA readily undergoes hydrolysis and condensation forming siloxane crosslinks in the material. Crosslinking with VTMOS exhibited improved modulus, strength, and impact toughness while showing a decrease in ductility. Incorporating silanol-terminated poly(dimethylsiloxane) (OH-PDMS) resulted in the formation of longer siloxane crosslinks. These samples showed an increase in modulus and impact toughness due to the crosslinking, while the longer siloxane linkages resulted in improved ductility and tensile toughness. This is unusual for polymers toughened through crosslinking reactions. Scanning Electron Microscopy (SEM) of the fractured surfaces showed the presence of these elongated siloxane crosslinks. This enhanced ability for the modified PLA to deform and absorb energy results in the increase in both impact and tensile toughness.

    LanguageEnglish (US)
    Pages799-809
    Number of pages11
    JournalExpress Polymer Letters
    Volume10
    Issue number10
    DOIs
    StatePublished - Oct 1 2016

    Profile

    Siloxanes
    Crosslinking
    Moisture
    poly(lactide)
    trimethoxyvinylsilane
    siloxanes
    crosslinking
    toughness
    moisture
    Toughness
    Ductility
    Fracture toughness
    ductility
    Silanes
    Free Radicals
    Extrusion
    Condensation
    Hydrolysis
    Polymers
    Scanning electron microscopy

    Keywords

    • Biodegradable polymers
    • Free radical grafting
    • Moisture induced crosslinking
    • PLA
    • Reactive extrusion

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry
    • Chemical Engineering(all)
    • Organic Chemistry
    • Physical and Theoretical Chemistry

    Cite this

    Moisture curable toughened poly(lactide) utilizing vinyltrimethoxysilane based crosslinks. / Schneider, J.; Bourque, K.; Narayan, R.

    In: Express Polymer Letters, Vol. 10, No. 10, 01.10.2016, p. 799-809.

    Research output: Research - peer-reviewArticle

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