Crystalline morphologies in segmented copolymers with hard segments of uniform length

Bryan B. Sauer, R. Scott McLean, R.J. Gaymans, M.C.E.J. Niesten

Research output: Contribution to journalArticleAcademic

39 Citations (Scopus)

Abstract

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× stretch ratio) and after relaxation.
Original languageUndefined
Pages (from-to)1783-1792
JournalJournal of polymer science. Part B: Polymer physics
Volume42
Issue number9
DOIs
Publication statusPublished - 2004

Keywords

  • Phase separation
  • AFM
  • Thermoplastic
  • IR-72003
  • Morphology
  • elastomers

Cite this