Intrinsic viscosities ([q]) of polystyrene solutions in cyclohexane above and below the 0 temperature have been measured using a capillary viscometer. The viscosity measurements were performed on five polystyrene samples with molecular weights of 6.3 ? 104, 9.0 x 104, 6.0 x 105, 2.8 ? 106 and 10 ? 106. A smooth and continuous contraction was observed below the 0 temperature (34.5°C). The temperature dependence of It/] can be represented by a master curve in a ot3lzlM 1/2 (gl/2 mol-1/2) versus IzlM 1/2 (gl/2 mol-1/2) plot, where ~,= [q(T)]/[q(O)] 1/a is a viscosity expansion factor and T= (T-O)/T is the reduced temperature. A universal plot of reduced viscosity (ct,) versus reduced blob parameter (N/Nc) shows the achievement of the collapsed state for the T < 0 region. The prediction of the temperature blob theory is also verified for the T> 0 region.
Посилання на статтю:
Studies of linear polymer dimensions of polystyrene in cyclohexane over a wide range of temperature by intrinsic viscosity / Bahattin M. Baysal* and Nurseli Uyanlk // Polymer. – 1992. – Vol 33. – P. 4798-4804.