TIT# SAXS investigation on the influence of oil dilution on morphological
     changes in a SBS block copolymer during the first draw cycle
AUT# Stribeck, N.; Bösecke, P.; Polizzi, S.
SOU# Colloid Polym. Sci. (1989), 267, 687-701
LOC# xv008  @selbst.ftx
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ABS# Spin-cast films of one pure SBS and two oil-extended SBS samples were
     observed during first cycle drawing in the synchrotron radiation beam
     at HASYLAB. for evaluation, from a two-dimensional Vidicon scattering
     pattern the scattering curve was extracted by intersecting perpendicular
     to the observed layer lines. Using a method described in a preceding
     paper (V.007), the scattering curve is analyzed by fitting to
     one-dimensional two-phase models. Essential for a fit with parameters
     of physical sense is the assumption of at least two components. One of
     these two main components is identified with fibrils containing PS
     cylinders, the axes of which are orientated parallel; the other is
     identified with fibrils containing cylinders transverse to the drawing
     direction. For the mechanical properties of the thermoplastic rubber this
     splitting of cylinder orientation in the drawn state seems to be of
     some importance. Only the cylinders of the longitudinal component turn
     out to be rigid, while the cylinders of the transversal component appear
     to yield and even break. The amount of cylinders allotted to each of the
     two components in the drawn state varies as a function of the diluent.
     An extrapolation of topological parameters back to the undrawn state
     indicates a possible reason, a fair variation of the cylindrical particle
     dimensions with in a "lattice cell" of only slightly varying dimensions.
     While paraffinic mineral oil dilution causes the cylinders lengths to
     decrease, thus improving cylinder orientability within the pseudo lattice
     cell, aromatic oil dilution increases the particles diameters. A
     remaining faint contribution to the scattering pattern that produces the
     layer lines is suggested not to be caused by a periodic structure, but
     by a single and precisely defined polybutadiene matrix length ("string")
     between two PS cylinders with a considerable height variance.