Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 40, Issue 23, Pages 4117-4130Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/pola.10499
Keywords
poly(ester urethane)s; morphology; WAXS; polycaprolactone; block copolymers; biodegradable; polyurethanes; structure-property relations
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Two series of poly(ester urethane)s were prepared, containing polycaprolactone (PCL) as the soft segment with molecular weights of 530 and 2000. In each series, the soft-segment/hard-segment ratio was varied, and the morphological changes were monitored with differential scanning calorimetry, dynamic mechanical thermal analysis, wide-angle X-ray scattering, and scanning electron microscopy techniques. The polyurethanes with longer PCL segments retained their crystallinity, whereas those with shorter PCL segments did not. A morphological model is proposed, in which a continuous PCL-rich matrix contains both PCL crystallites and domains of urethane hard segments. (C) 2002 Wiley Periodicals, Inc.
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