Abstract
In order to describe the structure of polymers in the molten or vitreous state four different kinds od static correlation functions should be studied experimentally: (i) the pair distribution function of the monomer units, (ii) the distance distribution function of the repeating units of a single chain, (iii) the orientation correlation function of the bond vectors, and (iv) the density fluctuation correlation function of the bulk sample. The appropriate methods include: X-ray wide-angle scattering and electron diffraction, small-angle neutron diffraction of deuterium tagged molecules, depolarized light scattering and magnetic birefringence, small-angle X-ray and polarized light scattering. A review of the results is presented with special emphasis on the differentation between short range order, as e.g. revealed from the pair distribution function, and long range correlations as proposed for the so-called “bundle” models. It is shown that there exists no experimental evidence for such a structure besides the “grains” in electron micrographs.
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