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Dynamics of partially miscible polylactide-poly(ε-caprolactone) blends in the presence of cold crystallization

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Abstract

Previous studies on polylactide (PLA)/poly(ε-caprolactone) (PCL) biodegradable blends revealed enhanced nucleation of PLA. The mechanism by which this enhancement of nuclei density occurs attracted significant interest. In this study, precursors’ transportation from PCL into PLA phase is invoked in order to interpret the experimental findings related to phase separation and crystallization. This mechanism is supported by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The DSC data revealed that PCL crystallinity within the blends is decreased with PLA content. In addition, POM data showed more nuclei within PLA as the PCL weight fraction is increased. The linear viscoelastic properties of these blends in the vicinity of the phase separation and cold crystallization boundary are examined. It is shown that the combination of POM and rheometry allows determining the phase diagram of the blend and identifying changes occurring due to phase separation and crystallization. Thus, the complete phase diagram of such systems can be fully determined, essential in process design and optimization.

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Acknowledgments

Financial assistance from the Natural Sciences and Engineering Research Council (NSERC) of Canada with the support from the NOVA Chemicals is gratefully acknowledged. Many thanks to Perstorp and Natureworks for kindly providing the materials for this project.

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, Canada

    Maziar Derakhshandeh, Nazbanoo Noroozi & Savvas G. Hatzikiriakos

  2. Department of Chemistry, The University of British Columbia, Vancouver, BC, Canada

    Laurel L. Schafer

  3. FORTH, Institute of Electronic Structure and Laser, Department of Materials Science and Technology, Heraklion, 70013, Crete, Greece

    Dimitris Vlassopoulos

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  1. Maziar Derakhshandeh
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  2. Nazbanoo Noroozi
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  3. Laurel L. Schafer
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  5. Savvas G. Hatzikiriakos
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Correspondence to Savvas G. Hatzikiriakos.

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Derakhshandeh, M., Noroozi, N., Schafer, L.L. et al. Dynamics of partially miscible polylactide-poly(ε-caprolactone) blends in the presence of cold crystallization. Rheol Acta 55, 657–671 (2016). https://doi.org/10.1007/s00397-016-0941-8

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  • DOI: https://doi.org/10.1007/s00397-016-0941-8

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