SEARCH Articles Figures Tables Direct observation of a repulsion between polymer chains in dilute solutions Electrostatic repulsion, polymer chain Excluded volume forces chain repulsion Flory parameter, repulsion between chains On a few simple properties of chains with repulsive interactions Purely attractive or repulsive chains existence of continuous models REPULSIVE CHAINS-OLD THEORIES Repulsion chain segments Repulsive chains at.finite concentrations The isolated repulsive chain