Abstract
The orientation parameters 〈P 2〉 of the chain segments in the amorphous layers of uniaxially drawn ethylene-tetrafluorethylene (ETFE) copolymers with different side chain modifications were determined from the separated amorphous halo of wide angle X-ray scattering (WAXS) measurements. The orientation distribution of the crystallographic axes in the ‘crystal’ domains, which show essentially a two-dimensional order in lateral direction, was obtained from the analysis of hk0 reflections. The crystal orientation is independent of the side chain modifications. Both the mean lattice constant and the mean extension of the coherent scattering domains were determined to be temperature-dependent using synchrotron radiation. The anomaly of these parameters at about 100°C is attributed to a transition of the crystal structure.
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