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

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

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",
language = "English (US)",
volume = "98",
pages = "2697--2708",
journal = "Polymer Degradation and Stability",
issn = "0141-3910",
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AU - Detyothin,Sukeewan

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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 - Maleic anhydride

KW - Peroxides

KW - Reactive extrusion

KW - Response surface methodology

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