Hydrodynamic properties and unperturbed dimensions of polycyclohexyl and polyphenyl methacrylates in various solvents

✍ Scribed by N. Hadjichristidis; M. Devaleriola; V. Desreux

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 596 KB
• Volume: 8
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(72)90045-6

✦ Synopsis

Al~traet--Intrinsic viscosity, sedimentation, light scattering and osmotic pressure measurements have been made on dilute solutions of polycyclohexyl (laCy) and of polyphenyl methaerylates (PPh). Relations between (~), (So), second virial coefficient and molecular weight have been established.

The applicability of the different theories (Stoekmayer-Fixman, Kurata--Stockmayer, Fox-Fiory, Cowie, Berry, Kamide--Moore) for the determination of the unperturbed dimensions from the viscosity data is discussed; Berry's relation fits best the experimental data. These dimensions calculated from the sedimentation data (Cowie--Bywater) and from the second virial coefficient data (Krigbaum) agree with those obtained by viscosity.

The flexibility factor a obtained for the two polymers is high, 2.5 (PCy) and 2" 8 (PPh), confirming previous results on poly-~-naphthyl and polydeeahydro-fl-naphthyl methacrylates. ~1)

The fact that the aromatic polymers have higher cr values than the corresponding saturated polymers may be due to a specific interaction between the aromatic groups and to their higher rigidity.