TIT# Small-angle x-ray scattering of segmented block copolyether esters
     during stretching
AUT# Stribeck, N.; Apostolov, A. A.; Zachmann, H. G.; Fakirov, C.;
     Stamm, M.; Fakirov, S.
SOU# Int. J. Polym. Mater. (1994), 25(3-4), 185-200
LOC# xv019  @selbst.ftx
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ABS# The scattering behavior of poly(ether ester) thermoplastic
     elastomers based on poly(butylene terephthalate) as hard segments
     and poly(ethylene glycol) ($\acute{M}_n$ = 100) as soft segments in a
     ratio 49/51 weight % is studied under stress.  Drawn ($\lambda=5$)
     bristles are annealed with fixed ends in order to create a std.
     initial surface.  Samples with structure destroyed by additional drawing
     as well as with structure regenerated by solid-state reactions or
     chemical crosslinking are prepared  The data from small-
     angle x-ray scattering (SAXS) taken under or
     without stress are evaluated using Stribeck's method and the sizes
     of crystalline ($\acute{d}_1$) and amorphous ($\acute{d}_2$) regions are directly
     obtained.  A constant value of $\acute{d}_1 \thickapprox 50$ higher than 80%
     due to axial displacement of the crystallites.  The size of the
     amorphous regions $\acute{d}_2$ measured under stress ($\epsilon$ >
     30-50%) rises slightly and reversibly followed by a drop similarly
     to the measurements without stress, thus indicating that the observed
     changes in the L-value are due to changes in the amorphous regions
     only.  Further, in thechemical crosslinked sample a reversible axial
     displacement of the crystallites is observed in the range $\epsilon$ =
     100-200%, suggesting a complete elimination of the
     interfibrillar contacts as well as stretching and relaxation
     of intrafibrillar tie molecules