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Viscoelastic properties of PLA/PCL blends compatibilized with different methods

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Abstract

The aim of this study was to observe changes in the viscoelastic properties of PLA/PCL (80/20) blends produced using different compatibilization methods. Reactive extrusion and high-energy radiation methods were used for blend compatibilization. Storage and loss moduli, complex viscosity, transient stress relaxation modulus, and tan δ of blends were analyzed and blend morphologies were examined. All compatibilized PLA/PCL blends had smaller dispersed particle sizes than the non-compatibilized blend, and well compatibilized blends had finer morphologies than poorly compatibilized blends. Viscoelastic properties differentiated well compatibilized and poorly compatibilized blends. Well compatibilized blends had higher storage and loss moduli and complex viscosities than those calculated by the log-additive mixing rule due to strong interfacial adhesion, whereas poorly compatibilized blends showed negative deviations due to weak interfacial adhesion. Moreover, well compatibilized blends had much slower stress relaxation than poorly compatibilized blends and didn’t show tan δ plateau region caused by slippage at the interface between continuous and dispersed phases.

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  1. School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, 38541, Republic of Korea

    Boo Young Shin & Do Hung Han

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  1. Boo Young Shin
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  2. Do Hung Han
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Shin, B.Y., Han, D.H. Viscoelastic properties of PLA/PCL blends compatibilized with different methods. Korea-Aust. Rheol. J. 29, 295–302 (2017). https://doi.org/10.1007/s13367-017-0029-8

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  • DOI: https://doi.org/10.1007/s13367-017-0029-8

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