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

Title
Rheological and Thermal Properties of the PLA Modified by Electron Beam Irradiation in the Presence of Functional Monomer
Author(s)
신부영라마니나라얀[라마니나라얀]한도흥
Keywords
CROSS-LINKING; VISCOELASTIC PROPERTIES; POLY(L-LACTIC ACID); REACTIVE EXTRUSION; POLY(LACTIC ACID); MOLECULAR-WEIGHT; RADIATION; POLYETHYLENE; PEROXIDE; BIODEGRADATION
Issue Date
201012
Publisher
SPRINGER/PLENUM PUBLISHERS
Citation
JOURNAL OF POLYMERS AND THE ENVIRONMENT, v.18, no.4, pp.558 - 566
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.
URI
http://hdl.handle.net/YU.REPOSITORY/23238http://dx.doi.org/10.1007/s10924-010-0198-8
ISSN
1566-2543
Appears in Collections:
공과대학 > 화학공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE