Models for Chain Cross Section

Whatever the statistical conformation of a polymer, the structure foctor has been iq to now calculated with the assumption that the chain is an infinite thin thread. However, the finite thickness of the chain often changes the scattering corves. It 6an happens at 

Equation 3-48 holds for qRc 1. At larger q a more explicite ejqnession for (q) is needed. If the substituents form a thin plane, the cross section leads to the characteristic q 2 scattering behavior of a flat particle. The normalized stmcture factor 0(q) is (24)  

Neutron Diffraction, first edition (Pergamon Pres, Oxford) (1966). 

AECL-8490, Chalk River Nuclear Laboratories, Ontario (1984). 

Landau, E.M. Lifshitz., Statistical Physics, 2nd edition (Pergamon Press, London) 1959. 

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