STRUCTURE OF DRAWN POLYMERS.
Rept for 1 Apr 63-31 Jul 64,
RESEARCH TRIANGLE INST DURHAM N C
Pagination or Media Count:
Morphology of deformed single crystals and chain mobility of cold drawn samples of polyethylene, polyoxymethylene and polycaprolactam were investigated by electron microscopy, electron diffraction and nuclear magnetic resonance. Due to the good and uniform adherence of solution grown single crystals of PE on the polyethylene terephathalate substrate, the study of small deformation ratios revealed the details of twinning, phase transformation, chain tilting and slip as functions of crystal orientation and temperature. In order to observe an intermediate case between single crystals and bulk polymers, the deformation of extremely thin polyethylene spherulites was also investigated. The morphology changes at small deformations were very similar to those with single crystals. Nuclear magnetic resonance investigation of cold drawn polyethylene and polyoxymethylene first revealed the marked anisotropy characteristic of the nearly complete uniaxial orientation. Moreover, in polyethylene an intermediate component was observed.