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International Journal of Polymer Science
Volume 2015, Article ID 795985, 8 pages
http://dx.doi.org/10.1155/2015/795985
Research Article

Chemical and Enzymatic Hydrolysis of Polyurethane/Polylactide Blends

1Department of Chemistry and Commodity Industrial Science, Gdynia Maritime University, 83 Morska Street, 81-225 Gdynia, Poland
2Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 Sklodowska-Curie Street, 41-819 Zabrze, Poland
3Department of Polymer Technology, Gdańsk University of Technology, 11/12 Narutowicza Street, 80-952 Gdańsk, Poland

Received 17 February 2015; Revised 28 April 2015; Accepted 11 May 2015

Academic Editor: Yakai Feng

Copyright © 2015 Joanna Brzeska et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polyether-esterurethanes containing synthetic poly[(R,S)-3-hydroxybutyrate] (R,S-PHB) and polyoxytetramethylenediol in soft segments and polyesterurethanes with poly(ε-caprolactone) and poly[(R,S)-3-hydroxybutyrate] were blended with poly([D,L]-lactide) (PLA). The products were tested in terms of their oil and water absorption. Oil sorption tests of polyether-esterurethane revealed their higher response in comparison to polyesterurethanes. Blending of polyether-esterurethanes with PLA caused the increase of oil sorption. The highest water sorption was observed for blends of polyether-esterurethane, obtained with 10% of R,S-PHB in soft segments. The samples mass of polyurethanes and their blends were almost not changed after incubation in phosphate buffer and trypsin and lipase solutions. Nevertheless the molecular weight of polymers was significantly reduced after degradation. It was especially visible in case of incubation of samples in phosphate buffer what suggested the chemical hydrolysis of polymer chains. The changes of surface of polyurethanes and their blends, after incubation in both enzymatic solutions, indicated on enzymatic degradation, which had been started despite the lack of mass lost. Polyurethanes and their blends, contained more R,S-PHB in soft segments, were degraded faster.