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Confinement is a versatile and well-established tool to study the propertiesof polymers either to understand biological processes or to develop newnano-biomaterials. We investigate the conformations of a semiflexible polymerring in weak spherical confinement imposed by an impenetrable shell. We developan analytic argument for the dominating polymer trajectory depending on polymerflexibility considering elastic and entropic contributions. Monte Carlosimulations are performed to assess polymer ring conformations in probabilitydensities and by the shape measures asphericity and nature of asphericity.Comparison of the analytic argument with the mean asphericity and the meannature of asphericity confirm our reasoning to explain polymer ringconformations in the stiff regime, where elastic response prevails.

Buckling of stiff polymer rings in weak spherical confinement