Rheological and Thermal Properties of the PLA Modified by Electron Beam Irradiation in the Presence of Functional Monomer

Boo Young Shin, Do Hung Han, Ramani Narayan

    Research output: Contribution to journalArticle

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    Abstract

    Polylactic acid (PLA) has been modified by electron beam radiation in the presence of glycidyl methacrylate (GMA) to enhance the melt strength of PLA. The modified PLA was prepared by varying both the amount of GMA and the irradiation dose and was characterized by observing the thermal properties, the melt viscoelastic properties and the gel fraction. For comparison, virgin PLA was also irradiated. All irradiated virgin PLA had a lower complex viscosity and a storage modulus compared to virgin PLA due to irradiation-induced chain scission. However, these properties were remarkably improved due to formation of long chain branching and retarding chain scission if GMA was introduced in this system. The increase in melt viscoelastic property was much dependent on the irradiation dose. At optimum doses of radiation, it showed maximum complex viscosity and storage modulus. The PLA irradiated with 20 kGy in the presence of 3 phr GMA showed a complex viscosity of about 10 times higher and a storage modulus of 100 times higher than those of virgin PLA at 0. 1 rad/s. Gel fraction measurement revealed that chain scission and branching was more dominant than crosslinking. The biodegradability of irradiated PLA was slightly decreased by the presence of GMA.

    Original languageEnglish (US)
    Pages (from-to)558-566
    Number of pages9
    JournalJournal of Polymers and the Environment
    Volume18
    Issue number4
    DOIs
    StatePublished - Dec 2010

    Profile

    Acids
    Irradiation
    Hand Injuries
    Dosimetry
    Elastic moduli
    Viscosity
    Coccidiostats
    Artificial Heart
    Electron beams
    Thermodynamic properties
    Gels
    Radiation
    Ageusia
    Entamoeba
    Carbonic Anhydrase Inhibitors
    Biodegradability
    Crosslinking
    Monomers
    Equilenin
    Buccal Administration

    Keywords

    • Biodegradability
    • Electron beam
    • Glycidyl methacrylate
    • Poly (lactic acid)
    • Rheological properties

    ASJC Scopus subject areas

    • Environmental Engineering
    • Polymers and Plastics
    • Materials Chemistry

    Cite this

    Rheological and Thermal Properties of the PLA Modified by Electron Beam Irradiation in the Presence of Functional Monomer. / Shin, Boo Young; Han, Do Hung; Narayan, Ramani.

    In: Journal of Polymers and the Environment, Vol. 18, No. 4, 12.2010, p. 558-566.

    Research output: Contribution to journalArticle

    Shin, Boo Young; Han, Do Hung; Narayan, Ramani / Rheological and Thermal Properties of the PLA Modified by Electron Beam Irradiation in the Presence of Functional Monomer.

    In: Journal of Polymers and the Environment, Vol. 18, No. 4, 12.2010, p. 558-566.

    Research output: Contribution to journalArticle

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    abstract = "Polylactic acid (PLA) has been modified by electron beam radiation in the presence of glycidyl methacrylate (GMA) to enhance the melt strength of PLA. The modified PLA was prepared by varying both the amount of GMA and the irradiation dose and was characterized by observing the thermal properties, the melt viscoelastic properties and the gel fraction. For comparison, virgin PLA was also irradiated. All irradiated virgin PLA had a lower complex viscosity and a storage modulus compared to virgin PLA due to irradiation-induced chain scission. However, these properties were remarkably improved due to formation of long chain branching and retarding chain scission if GMA was introduced in this system. The increase in melt viscoelastic property was much dependent on the irradiation dose. At optimum doses of radiation, it showed maximum complex viscosity and storage modulus. The PLA irradiated with 20 kGy in the presence of 3 phr GMA showed a complex viscosity of about 10 times higher and a storage modulus of 100 times higher than those of virgin PLA at 0. 1 rad/s. Gel fraction measurement revealed that chain scission and branching was more dominant than crosslinking. The biodegradability of irradiated PLA was slightly decreased by the presence of GMA.",
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    KW - Electron beam

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    KW - Poly (lactic acid)

    KW - Rheological properties

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