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We establish a macroscopic description of the splay--density coupling insemiflexible main-chain nematic polymers with hairpins, using a vectorialcontinuity constraint for the "recovered" polar order of the chain tangents andintroducing chain backfolds (hairpins) as its new type of sources besides chainends. We treat both types of sources on a unified basis as a mixture of twoideal gases with fixed composition. Performing detailed Monte Carlo simulationsof nematic monodomain melts of "soft" worm-like chains with variable length andflexibility, we show via their structure factors that the chain backfoldingweakens the splay--density coupling, and demonstrate how this weakening can beconsistently quantified on the macroscopic level. We also probe and discuss thedeviations from the noninteracting gas idealization of the chain ends andbackfolds.

Splay--density coupling in semiflexible main-chain nematic polymers with hairpins