An analysis of excluded-volume effects in a polystyrene-cyclohexane system

✍ Scribed by Suzuki, Hidematsu

• Book ID: 104527175
• Publisher: Wiley (John Wiley & Sons)
• Year: 1982
• Tongue: English
• Weight: 572 KB
• Volume: 14
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980140403

✦ Synopsis

Abstract

An attempt was made to analyse Miyaki's data for the radius of gyration 2> and the intrinsic viscosity [η] of very high molecular weight samples of polystyrene in cyclohexane. The excluded‐volume variable z was estimated by adopting the temperature dependence of the excluded‐volume integral as predicted by Eichinger. It was found that the volume expansion as given by the ratio of 2> to 2>~0~ under the unperturned state was a function of z only, as required by two‐parameter theories. These data were in good agreement with the Domb‐Barrett and the Suzuki equations. On the other hand, the ratio of [η] to [η] ~0~ under the unperturbed state also gave a single composite curve when plotted against z. However, it was found that the observed hydrodynamic behaviour was not satisfactorily explained by two‐parameter theories of [η]. A brief comment was made on the validity of two‐parameter theories from the experimental point of view.