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We perform computer simulations of mechanically linked (poly[2]catenanes, PC)and chemically bonded (bonded rings, BR) pairs of self-avoiding ring polymersin steady shear. We find that BR's develop a novel motif, termed gradienttumbling, rotating around the gradient axis. For the PC's the rings arestretched and display another new pattern, termed slip-tumbling. The dynamicsof BR's is continuous and oscillatory, whereas that of PC's is intermittentbetween slip-tumbling attempts. Our findings demonstrate the interplay betweentopology and hydrodynamics in dilute solutions of connected polymers.

Effects of linking topology on the shear response of connected ring polymers: Catenanes and bonded rings flow differently