TIT# SAXS investigation of the structure of high-pressure crystallized
     poly(ethylene terephthalate): a new nanostructured material?
AUT# Stribeck, N.; Zachmann, H. G.; Bayer, R. K.; Baltà Calleja, F. J.
SOU# J. Mater. Sci. (1997), 32(6), 1639-1647
LOC# xv026  @selbst.ftx
CLA#
COM#
APP#
MAT#
ABS# The common crystallization conditions of poly(ethylene terephthalate) (PET)
     were replaced by an anabaric high-pressure crystallization at 320 °C.
     The PET samples were characterized by differential scanning
     calorimetry, d. and microhardness.  The resulting two-phase
     microstructure was studied by means of absolute small-
     angle X-ray scattering (SAXS).
     A complete SAXS analysis utilizing the interface distribution
     function (IDF) method was carried out.  The resulting structure
     exhibited the presence of stacks of 10 nm thick crystalline lamellae
     which were separated by amorphous layers of about 1.3 nm thickness.
     Similar structures have been found after annealing of amorphous
     metals and have been termed nanocrystalline  Microhardness and structure
     have been discussed in analogy with the notions from the field of
     nanostructured materials.  Theor., a multi-component lamellar
     two-phase structure has been discussed.  The equations derived allow
     the computation of vol. fractions and sp. surfaces of the components
     (different kinds of stacks).