Depolarization measurements of polymer solutions at high dilutions. Part II

AbstractDepolarization measurements of transversely scattered light were determined for well fractionated samples of poly(methyl methacrylate) in methyl ethyl ketone and a critical consolute mixture of methyl ethyl ketone and isopropanol (1 : 1 by volume). ρu and ρv in methyl ethyl ketone decrease with increasing concentration and tend to become constant above a certain critical concentration, while in the critical consolute mixture, the values decrease steadily with increasing concentration. The ρh values increase with increasing concentration in methyl ethyl ketone, while in the critical consolute mixture they are independent of concentration; this indicates that the size does not change in critical consolute mixture. The individual components Hv and Vv are analyzed for the poly(viny1 acetate) and poly( methyl methacrylate) systems studied by plotting Hv,/C and Vv,/C versus concentration. The observed discrepancies from Doty's predictions are explained.