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Small angle X‐ray scattering pole figures of semicrystalline polymers obtained by synchrotron radiation
Author(s) -
Röber S.,
Bösecke P.,
Zachmann H.G.
Publication year - 1988
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19880150123
Subject(s) - scattering , materials science , optics , goniometer , small angle scattering , small angle x ray scattering , synchrotron radiation , wide angle x ray scattering , grazing incidence small angle scattering , pole figure , crystal (programming language) , synchrotron , beam (structure) , radius , crystallinity , diffraction , small angle neutron scattering , neutron scattering , physics , composite material , computer security , computer science , programming language
A goniometer for measuring small angle X‐ray scattering pole figures by using synchrotron radiation has been constructed. In order to obtain the scattering in a large range of scattering angles, position‐sensitive detectors (Gabriel counter and vidicon system) are applied. The integrated intensity as well as the position and the half width of the maximum are determined as functions of the angle between the incident beam and the normal to the film surface of the sample. The time necessary to determine a pole figure was approximately 3 hours. Samples of poly(ethylene terephthalate) were drawn under different conditions: uniaxially and biaxially at 92°C under homogeneous deformation, and uniaxially at 40°C by necking. The influence of the drawing conditions on the orientation of the crystal lamellae was determined. The results of the small angle scattering are compared with pole figures obtained by wide angle scattering. In addition some results with polypropylene were obtained. The small angle X‐ray scattering is strongly affected by the limited size of the crystals and by the incomplete regular arrangement of the crystals. This gives rise to difficulties in the interpretation of the results. The problem will be discussed.