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The tube model is a central concept in polymer physics, and allows to reducethe complex many-filament problem of an entangled polymer solution to a singlefilament description. We investigate the probability distribution function ofconformations of confinement tubes and single encaged filaments in entangledsemiflexible polymer solution. Computer simulations are developed that mimicthe actual dynamics of confined polymers in disordered systems with topologicalconstraints on time scales above local equilibration but well below large scalerearrangement of the network. We observe the statistical distribution ofcurvatures and compare our results to recent experimental findings.Unexpectedly, the observed distributions show distinctive differences from freepolymers even in the absence of excluded volume. Extensive simulations permitto attribute these features to entropic trapping in network void spaces. Thetransient non-equilibrium distributions are shown to be a generic feature inquenched-disorder systems on intermediate time scales.

Conformations of entangled semiflexible polymers: entropic trapping and transient non-equilibrium distributions