Abstract
The static structure factor of a semidilute solution of polydisperse rodlike macromolecules interacting via a hard core repulsion is calculated in the second virial approximation. A suitable substitution reduces the governing set of coupled integral equations to a single integral equation, which is attacked analytically by applying a variational principle. It is shown that the resulting expression for the structure factor is thermodynamically consistent. By way of example the structure factor of a bidisperse solution of rods is discussed and the marked effect of very small amounts of the higher molecular weight species demonstrated
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