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Received November 6, 2012
Accepted March 3, 2013
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Effect of organoclay on non-linear rheological properties of poly(lactic acid)/poly(caprolactone) blends
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 609-735, Korea
Korean Journal of Chemical Engineering, May 2013, 30(5), 1013-1022(10), 10.1007/s11814-013-0035-6
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Abstract
The nonlinear viscoelastic properties of PLA/PCL blends with and without clay (montmorillonite, MMT) under large amplitude oscillatory shear (LAOS) flow were investigated. The G' and G'' as a function of strain amplitude, Lissajous plots and FT-rheology methods were used to interpret nonlinear behavior of PLA/PCL blends with and without MMT. Additionally, scanning electron microscopy (SEM) images of PLA/PCL with MMT blends were taken to investigate the effects of clay on the internal structure of the PLA/PCL blends. A relationship between morphological changes and linear and nonlinear rheological properties was observed. SEM image analysis revealed that clay acted as a compatibilizer and then reduced the size of droplets in the PCL domain of the PLA matrix. As a result, nonlinear properties sensitively reflect morphological changes with increasing MMT amount. The nonlinear rheological properties of PLA/ PCL/MMT/metallocene-LLDPE (mLLDPE) were also investigated when mLLDPE was used as an impact modifier to improve mechanical properties, and the nonlinear rheological properties of PLA/PCL/MMT and PLA/PCL/MMT/mLLDPE were also compared.
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References
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Vittorias I, Lilge D, Baroso V, Wilhelm M, Rheol. Acta, 50(7-8), 691 (2011)
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Wilhelm M, Maring D, Spiess HW, Rheol. Acta, 37(4), 399 (1998)
Filipe S, Cidade MT, Wilhelm M, Maia JM, J. Appl. Polym.Sci., 99, 347 (2004)
Carotenuto C, Grosso M, Maffettone PL, Macromolecules, 41(12), 4492 (2008)
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Ewoldt RH, Hosoi AE, McKinley GH, J. Rheol., 52(6), 1427 (2008)
Wilhelm M, Reinheimer P, Ortseifer M, Rheol. Acta, 38(4), 349 (1999)
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Cardenas MA, Perera R, Villarreal N, RosaleS C, Pastor JM, J. Appl. Polym. Sci., 106(4), 2298 (2007)
