Computer experiments simulating athermal polymer solutions on a simple cubic lattice have been performed at various concentrations and chain lengths n. The mean-square end-to-end distance 〈r2〉 seems to decrease steadily as the polymer volume fraction φ increases, this effect becoming more pronounced when the chain gets longer. For large n and low φ, a reasonable fit of the data is obtained with 〈r2〉φ/〈r2〉0 ≃ 1 - 0.043n0.72 φ.
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Vos et al. (1974) studied this question.