Abstract
Studies in the viscosity behavior of dilute solutions of crepe and deproteinized natural rubber in different solvents have shown that carbon tetrachloride and other chlorinated solvents are not suitable for viscosity determinations of rubber. Data are presented to show that the anomalous increase of viscosity at very high dilutions cannot be explained by Öhrn's adsorption hypothesis but could be attributed to the extension and disentangling of polymer chains at higher dilutions. The anomaly is also shown to disappear if the solutions are shaken for a minimum period of time before viscosity determinations.
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