With optical tweezers plus fluorescent labels it is now possible to force, and to observe, the stretching and the relaxation of a single polymer chain. We calculate here the unwinding of a tethered, flexible, chain ( N monomers) immersed in a solvent if, at time t = 0 starting from rest, one imposes either a flow ( V ) of the solvent, or an external force f on the free end.
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Brochard‐Wyart et al. (1994) studied this question.
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