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.

    Original languageEnglish (US)
    Pages (from-to)2697-2708
    Number of pages12
    JournalPolymer Degradation and Stability
    Volume98
    Issue number12
    DOIs
    StatePublished - Dec 2013

    Profile

    anhydrides
    Maleic anhydride
    screws
    molecular weight
    Molecular weight
    Flupenthixol
    Progesterone
    lactic acid
    initiators
    titration
    methodology
    Compatibilizers
    Polydispersity
    Lactic acid
    Hexane
    Titration
    Edema Disease of Swine
    Bibliography of Medicine
    Dihydropteroate Synthase
    Accessory Nerve

    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",
    month = "12",
    doi = "10.1016/j.polymdegradstab.2013.10.001",
    volume = "98",
    pages = "2697--2708",
    journal = "Polymer Degradation and Stability",
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    AU - Detyothin,Sukeewan

    AU - Selke,Susan E M

    AU - Narayan,Ramani

    AU - Rubino,Maria

    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.

    AB - 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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    KW - Peroxides

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