Perturbation Theory of Polymer Chains Revisited, 2—Intermolecular Excluded Volume of Random and Self‐Avoiding Walks

The intermolecular compatibility of 10 7 –10 8 independent pair configurations of linear chains (chain length 64 ≤  N  ≤ 8192) with and without intra molecular interaction on various lattices is checked and the intermolecular excluded volume u evaluated. From the (average) number of possible i ‐tuples of overlaps in the pair configurations the parameters C k of the perturbation theory are calculated. Differences between the various lattice types at finite N vanish completely for N   →  ∞. While the theoretical values of C 1 and C 2 were recovered within very narrow limits for chains without intramolecular interaction, markedly higher figures apply to self‐avoiding walks. The excluded volume u itself and higher C k parameters are called upon to test several classical and renormalized perturbation theories.