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

Kang, Kyoung Soo (School of Display and Chemical Engineering, Yeungnam University)
Shin, Boo Young (School of Display and Chemical Engineering, Yeungnam University)
Publication Information
Korean Chemical Engineering Research / v.46, no.1, 2008 , pp. 124-130 More about this Journal
Abstract
In order to fabricate a modified poly (lactic acid) (PLA) for applications requiring high melt strength, a PLA has been irradiated in the presence of functional monomer of glycidyl methacrylate (GMA). Samples were prepared with various contents of GMA and irradiation dosages, and were characterized by observing their thermal and melt viscoelastic properties and gel faction. The complex viscosity and storage modulus of the modified PLA without GMA were lower than those of the original PLA. Those of the modified PLA decreased with increasing dosage. In the case of the modified PLA containing 0.1 phr or 0.3 phr of GMA, their changing tendency with dosage was similar to the irradiated PLA without GMA. However, the 5 kGy irradiated PLA containing 0.5 phr of GMA showed the greatly enhanced complex viscosity and storage modulus, which were about 3 and 10 times higher than those of the original PLA at a frequency of 0.1 rad/s, respectively.
Keywords
Poly (lactic acid); Electron Beam Irradiation; Glycidyl Methacrylate; Complex Viscosity; Modified Cole-Cole Plot;
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