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A few deuterated polystyrene chains are dispersed in a solution of protonated polystyrene and carbone disulfide. The neutron scattered intensity is measured at several concentrations of protonated chains. Already in the semidilute range, there is a striking contrast with the results obtained at equal concentrations in fully deuterated solutions. The dependence of the pair correlation function on concentration is discussed in terms of the excluded volume exponent

Shape change of the flexible polymer in solution with increasing concentration