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We study the dynamics and conformation of polymers composed by activemonomers. By means of Brownian dynamics simulations we show that when thedirection of the self-propulsion of each monomer is aligned with the backbone,the polymer undergoes a coil-to-globule-like transition, highlighted by amarked change of the scaling exponent of the gyration radius. Concurrently, thediffusion coefficient of the center of mass of the polymer becomes essentiallyindependent of the polymer size for sufficiently long polymers or largemagnitudes of the self-propulsion. These effects are reduced when theself-propulsion of the monomers is not bound to be tangent to the backbone ofthe polymer. Our results, rationalized by a minimal stochastic model, open newroutes for activity-controlled polymer and, possibly, for a new generation ofpolymer-based drug carriers.

Globule-like conformation and enhanced diffusion of active polymers