Abstract
Abstract We report observations of the coil-globule transition of a single polymer chain in solution. For polyacrylamide (MW = 5−6×106), the transition occurs when the acetone concentration of the acetone water solvent is increased. In polystyrene (MW = 26×106)—cyclohexane solutions, the transition is induced by lowering the temperature. Since the transition to the globule state is in competition with inter-polymer aggregation, measurements must be made at very low polymer concentrations. By measuring the angular dependence of the time-dependent and time-independent parts of the correlation function of light scattered from dilute solutions of polymer (<.1 μg/m1), we have determined the radius of gyration and hydordynamic radius of the globule state before the onset of aggregation.
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