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Phase Behavior and Its Viscoelastic Response of Polylactide/poly(ε-caprolactone) Blend by Defeng Wu; Yisheng Zhang; Ming Zhang; Weidong Zhou is a Materials Science article available to read on EtoBox.

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a b s t r a c t Polylactide (PLA)/polycaprolactone (PCL) blends with various blend ratios were prepared via melt mixing. The morphology, linear and non-linear viscoelastic properties of the blend were studied using scanning electron microscope (SEM) and cone-plate rheometer. Three typical immiscible morphologies, i.e., spherical droplet, fibrous and co-continuous structure can be observed at various compositions. The elasticity ratio was proposed to play an important role together with the viscosity on the phase inversion because PLA/PCL blend presents a high viscosity ratio between two components. Two emulsion models were used to predict the linear viscoelastic properties of the blend with various morphologies. The Palierne model gives better fit compared with the G-M model, but both fail to predict the viscoelastic properties of the co-continuous blend. The viscoelastic behavior of those blends shows different temperature dependence due to their different morphologies. The principle of time-temperature superposition (TTS) is only valid for the co-continuous blend while fails with the rheological data of those blends with discrete spherical and fibrous domain structure. Moreover,

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Author

Defeng Wu; Yisheng Zhang; Ming Zhang; Weidong Zhou

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)