VISCOSITY STUDY OF POLYSTYRENE IN CYCLOHEXANE

The intrinsic viscosities of five different molecular weight polystyre nes in cyclohexane were measured at different temperatures. The temper atures cover three regions: above the theta point, at the theta point and below the theta point. The data were analysed with the theoretical framework on critical phenomena as a guide line. Although the collaps ed region and the totally collapsed region vary with the range of mole cular weight, the scaling law appears to be valid. There is a one-to-o ne correspondence of an observable in one regime to another regardless of the number of links. (C) 1997 Elsevier Science Ltd.