The determination of molecular weight of polymer from phase separation in a ternary system: solvent-polymer 1-polymer 2
The determination of molecular weight of polymer from phase separation in a ternary system:
solvent-polymer 1-polymer 2
The possibility of determining molecular weight of polymers from phase separation in solutions of mixtures of incompatible polymers has been investigated. The experiments have been carried out with mixtures of fractions of the following polymer pairs: polystyrene — poly(vinyl acetate) and polystyrene — poly(methyl methacrylate) in common solvents: benzene, toluene, dioxane, methylethylketone and chloroform. It has been found that the relation suggested by Lipatov, m1/V1M1 = m2/V2M2, can be used for the determination of molecular weight, if the concentration range approaches the limiting concentration of miscibility, above which phase separation occurs. In more concentrated solutions, however, the effect of the solvent prevails over the molecular weight effect on the volume ratio of two phases and the results obtained are erroneous.
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