TIT#  Strain-induced polymorphic transition in poly(butylene terephthalate)
      and in its blend with poly(ether ester) thermoplastic elastomer as
      revealed by synchrotron radiation
AUT# Apostolov, A. A.; Fakirov, S.; Pavlov, M.; Stribeck, N.;
SOU# J. Mater. Sci. Lett. (2001), 21(2), 145-147
LOC# xv064
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ABS# The study shows that in PBT / PEE blend two populations of
     crystallographically identical PBT crystallites coexist which can
     be discriminated by different orientation, perfection and origin. The
     more perfect component originates from homo-PBT, the less perfect
     one from the PBT blocks in the copolymer. By annealing at suitable
     temperature the less perfect component is transferred to isotropic
     state, whereas the more perfect one does not melt and remains oriented.
     To the best of our knowledge there is no other report on the coexistence
     of two species of crystallographically identical crystals one of which
     is isotropic whereas the other is highly oriented.