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We study bottlebrush macromolecules in a good solvent by small-angle neutronscattering (SANS), static light scattering (SLS), and dynamic light scattering(DLS). These polymers consist of a linear backbone to which long side chainsare chemically grafted. The backbone contains about 1600 monomer units (weightaverage) and every second monomer unit carries side-chains with ca. 60 monomerunits. The SLS- and SANS data extrapolated to infinite dilution lead to theform factor of the polymer that can be described in terms of a worm-like chainwith a contour length of 380 nm and a persistence length of 17.5 nm. Ananalysis of the DLS data confirm these model parameters. The scatteringintensities taken at finite concentration can be modeled using the polymerreference interaction site model. It reveals a softening of the bottlebrushpolymers caused by their mutual interaction. We demonstrate that thepersistence decreases from 17.5 nm down to 5 nm upon increasing theconcentration from dilute solution to the highest concentration 40.59 g/l underconsideration. The observed softening of the chains is comparable to thetheoretically predicted decrease of the electrostatic persistence length oflinear polyelectrolyte chains at finite concentrations.

Softening of the stiffness of bottlebrush polymers by mutual interaction