| Description |
vi, 67 leaves : illustrations ; 28 cm |
| Summary |
"The effect of concentration on the viscosity of dilute and moderately concentrated polymer solutions was studied for eight narrow molecular weight polystyrene samples (900<M<1.177x10⁶) in cyclohexane at 34.5°C (a reported theta solvent), four polystyrene samples (1.5x10⁴<Mw<1.77x10⁶) in toluene at 30.0°C (a good solvent), and two fractionated polycarbonates (Mw=2.80x10⁵ and 1.89x10⁵) and two unfractionated polycarbonates (Mw=3.23x10⁴ and 4.4x10⁴) in methylene chloride at 25.0°C (A good solvent). The values of k' for the polystyrene samples in cylohexane are about 0.59 independent of molecular weight. The values of k' for the polystyrene samples in toluene increase from 0.32 to 0.56 as molecular weight decreases. The values of k' for the polycarbonates in methylene chloride are about 0.40"--Abstract, leaf 1. |
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