A polymer melt is an incompressible monomer liquid with no concentration fluctuations; it scatters neither photons nor neutrons. The polymer's conformation cannot be obtained by this experiment. This absence of scattering, s (q) = 0 in equation (1), corresponds to compensation between intrachain and interchain concentration fluctuations, i.e. :
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(1) - HIGGINS (J.S.), BENOIT (H.C.) - Polymers and neutron scattering (Polymères et diffusion de neutrons) - . 436 p. (1994) Clarendon Press.
(2) - COTTON (J.P.) - Introduction to scattering experiments (Introduction aux expériences de diffusion aux petits angles) - . P. Lindner et T. Zemb Éds...
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