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Improving the barrier character of poly(caprolactone): Transport properties and free volume of immiscible blends

In this work, the barrier character of poly(caprolactone) is improved with the addition of a poly(hydroxy amino ether). The analysis by means of thermal, thermomechanical, and morphology characterization reveals that the blends are partially miscible. The characterization of the morphology has revealed that the blends show a droplet matrix morphology. The free volume of the samples has been characterized by positron annihilation lifetime spectroscopy observing a decrease in the free volume as the poly(hydroxyamino ether) (PHAE) content increases. The barrier character to water vapor and carbon dioxide is greatly improved with the addition of PHAE. However, the observed improvement does not arise only from the reduced free volume, playing the interactions between penetrants and polymers a major role. Overall, this work aims to provide a further insight on the factors affecting the improvement of the barrier character of biodegradable polymers, which would allow developing new materials for packaging applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48018.

Publication date: 13/07/2019

Author: Sorkunde Eceolaza, Ainara Sangroniz, Javier Río, Marian Iriarte, Agustin Etxeberria

Reference: doi:10.1002/app.48018

Journal of Applied Polymer Science


This project has received funding from the Bio Based Industries Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 837761.