Reactive functionalization of poly(lactic acid), PLA: Effects of the reactive modifier, initiator and processing conditions on the final grafted maleic anhydride content and molecular weight of PLA

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    Abstract

    A response surface methodology (RSM) design was used to analyze the effects of maleic anhydride (MA) and 2,5-bis(tert-butylperoxy)-2,5-dimethyl hexane (Luperox or L101) content, and TSE screw speed on the degree of grafted MA (MAg) and number average molecular weight (Mn) of maleated PLA (PLA-g-MA), which can be used as a reactive compatibilizer in production of PLA blends with various components. PLA-g-MA's FTIR peaks indicated that MA was grafted onto the PLA backbone and oligomeric MA was also present. A maximum of 0.52 wt% MAg determined by titration was achieved at the expense of a 50% reduction of Mn and an increase in the polydispersity index to around 2.0. Generally, increasing L101 increased the degree of grafting and decreased Mn. L101 and MAg had a large effect on the stability of PLA-g-MA's Mn during storage. Nominally, amounts of MA equal to 4.5 wt%, L101 between 0.45 and 0.65 wt%, and screw speed of 20 rpm provided the optimal conditions for grafting MA onto PLA.

    LanguageEnglish (US)
    Pages2697-2708
    Number of pages12
    JournalPolymer Degradation and Stability
    Volume98
    Issue number12
    DOIs
    StatePublished - Dec 2013

    Profile

    lactic acid
    initiators
    anhydrides
    molecular weight
    Maleic Anhydrides
    Molecular weight
    Processing
    poly(lactic acid)
    Maleic anhydride
    Lactic acid
    screws
    titration
    methodology
    Compatibilizers
    Polydispersity
    Hexanes
    Titration
    Hexane

    Keywords

    • Grafting
    • Maleation
    • Maleic anhydride
    • Peroxides
    • Reactive extrusion
    • Response surface methodology

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry
    • Mechanics of Materials
    • Condensed Matter Physics

    Cite this

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    title = "Reactive functionalization of poly(lactic acid), PLA: Effects of the reactive modifier, initiator and processing conditions on the final grafted maleic anhydride content and molecular weight of PLA",
    abstract = "A response surface methodology (RSM) design was used to analyze the effects of maleic anhydride (MA) and 2,5-bis(tert-butylperoxy)-2,5-dimethyl hexane (Luperox or L101) content, and TSE screw speed on the degree of grafted MA (MAg) and number average molecular weight (Mn) of maleated PLA (PLA-g-MA), which can be used as a reactive compatibilizer in production of PLA blends with various components. PLA-g-MA's FTIR peaks indicated that MA was grafted onto the PLA backbone and oligomeric MA was also present. A maximum of 0.52 wt% MAg determined by titration was achieved at the expense of a 50% reduction of Mn and an increase in the polydispersity index to around 2.0. Generally, increasing L101 increased the degree of grafting and decreased Mn. L101 and MAg had a large effect on the stability of PLA-g-MA's Mn during storage. Nominally, amounts of MA equal to 4.5 wt%, L101 between 0.45 and 0.65 wt%, and screw speed of 20 rpm provided the optimal conditions for grafting MA onto PLA.",
    keywords = "Grafting, Maleation, Maleic anhydride, Peroxides, Reactive extrusion, Response surface methodology",
    author = "Sukeewan Detyothin and Selke, {Susan E M} and Ramani Narayan and Maria Rubino and Rafael Auras",
    year = "2013",
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    AU - Auras,Rafael

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    N2 - A response surface methodology (RSM) design was used to analyze the effects of maleic anhydride (MA) and 2,5-bis(tert-butylperoxy)-2,5-dimethyl hexane (Luperox or L101) content, and TSE screw speed on the degree of grafted MA (MAg) and number average molecular weight (Mn) of maleated PLA (PLA-g-MA), which can be used as a reactive compatibilizer in production of PLA blends with various components. PLA-g-MA's FTIR peaks indicated that MA was grafted onto the PLA backbone and oligomeric MA was also present. A maximum of 0.52 wt% MAg determined by titration was achieved at the expense of a 50% reduction of Mn and an increase in the polydispersity index to around 2.0. Generally, increasing L101 increased the degree of grafting and decreased Mn. L101 and MAg had a large effect on the stability of PLA-g-MA's Mn during storage. Nominally, amounts of MA equal to 4.5 wt%, L101 between 0.45 and 0.65 wt%, and screw speed of 20 rpm provided the optimal conditions for grafting MA onto PLA.

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