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

Salehiyan, Reza; Hyun, Kyu

Authors

Reza Salehiyan

Kyu Hyun



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.

Journal Article Type Article
Acceptance Date Mar 3, 2013
Online Publication Date Apr 20, 2013
Publication Date 2013-05
Deposit Date Jan 30, 2023
Journal Korean Journal of Chemical Engineering
Print ISSN 0256-1115
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 30
Issue 5
Pages 1013-1022
DOI https://doi.org/10.1007/s11814-013-0035-6
Keywords LAOS, Nonlinear Viscoelastic Properties, FT-rheology, PLA/PCL Blends, PLA/PCL/MMT, PLA/PCL/MMT/mLLDPE