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Effect of organoclay on non-linear rheological properties of poly(lactic acid)/poly(caprolactone) blends

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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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Authors and Affiliations

  1. School of Chemical and Biomolecular Engineering, Pusan National University, Busan, 609-735, Korea

    Reza Salehiyan & Kyu Hyun

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  1. Reza Salehiyan
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  2. Kyu Hyun
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Correspondence to Kyu Hyun.

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Salehiyan, R., Hyun, K. Effect of organoclay on non-linear rheological properties of poly(lactic acid)/poly(caprolactone) blends. Korean J. Chem. Eng. 30, 1013–1022 (2013). https://doi.org/10.1007/s11814-013-0035-6

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  • DOI: https://doi.org/10.1007/s11814-013-0035-6

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