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

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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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Acknowledgement

This research was supported by the Yeungnam University research grants in 2008.

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Authors and Affiliations

  1. School of Display and Chemical Engineering, Yeungnam University, Gyeongsan, 712-749, Korea

    Boo Young Shin & Do Hung Han

  2. Department of Chemical Engineering and Material Science, Michigan State University, East Lansing, MI, 48824, USA

    Ramani Narayan

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  1. Boo Young Shin
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  2. Do Hung Han
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  3. Ramani Narayan
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Correspondence to Boo Young Shin.

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Shin, B.Y., Han, D.H. & Narayan, R. Rheological and Thermal Properties of the PLA Modified by Electron Beam Irradiation in the Presence of Functional Monomer. J Polym Environ 18, 558–566 (2010). https://doi.org/10.1007/s10924-010-0198-8

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  • DOI: https://doi.org/10.1007/s10924-010-0198-8

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