Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 42, Issue 9, Pages 1783-1792Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/polb.20060
Keywords
AFM; elastomers; phase separation; morphology; thermoplastic
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The crystal morphological properties of segmented poly(ether ester aramide) elastomers with aromatic hard-segment amide units of uniform length were studied. Four samples with hard-segment fractions ranging from 3.4 to 9 wt % were studied by tapping atomic force microscopy (AFM). For one sample, both solution and melt-processed surfaces were examined, and similar crystal morphologies were found. The semicrystalline morphologies of these polymers had some similarities to other low-hard-segment segmented elastomers. The very thin needlelike or ribbonlike crystallites at the surface had a high aspect ratio for all the samples. The main difference observed for the different compositions was a decrease in the surface area density of ribbons with a decrease in the hard-segment fraction. One sample was chosen for in situ AFM studies during film extension. The details of the crystallite orientation and breakup were studied in increments up to 700% elongation (8 X stretch ratio) and after relaxation. (C) 2004 Wiley Periodicals, Inc.
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