Abstract
Kinetic viscometric measurements have been used to investigate the effect of change of solvent on association in polyacrylonitrile solutions. For solutions of the polymer in N,N′-dimethylformamide, N,N′-dimethylacetamide and γ-butyrolactone with benzene and carbon tetrachloride as added non-solvents, the dependence of the association on the solubility parameter, calculated for the mixed liquids, is shown to be most pronounced for solutions in dimethylformamide. The temperature dependence of the rate constant has been determined for each solvent/non-solvent system and the activation energy was found to be 7.3 ± 2.6 kcal mole−1, assuming that two intermolecular bonds are required to form the micro-gel particle.
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