TIT# Investigation of the Deformation of Homogeneous Poly(ethylene-co-1-octene)
     by Wide- and Small-angle X-ray Scattering using Synchrotron Radiation
AUT# Androsch, R.; Stribeck, N.; Lüpke, T.; Funari, S. S.;
SOU# J. Polym. Sci. Part B: Polym. Phys. (2002), 40(17), 1919-1930
LOC# xv072
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ABS# The deformation behavior of homogenous ethylene-1-octene copolymers of
     different initial structure has been investigated by wide-angle and
     small-angle X-ray scattering using synchrotron radiation.  The initial
     structure is controlled by the copolymer composition and by the condition
     of melt-crystallization.  The deformation includes rotation of crystals,
     which is followed by plastic deformation and complete melting of the
     initial crystal population, and final formation of micro-fibrils.  The
     process of rotation, plastic deformation and melting of crystals of the
     initial structure is completed at lower strain if the crystal size /
     perfection decreases.  The structure of the micro-fibrils is independent
     on the condition of prior melt-crystallization, which supports the notion
     of complete melting of the initial crystal population.  The deformation of
     the low-crystalline copolymer is characterized by large reversible
     retraction after stress-release.  This can be explained by stress-induced
     formation of a temporary network of crystals and an increased number of
     entanglements in the amorphous phase.  The structure of the micro-fibrils
     before and after stress-release is discussed.