Abstract
Except for solubility of low molecular weight fractions and anomalous spreading of the very high molecular weight fraction Gelva V 1700, the films of the polyvinyl acetate polymers studied were stable and well behaved. Extrapolation of the F × A– F plots for these films to obtain molecular weights does not appear feasible, as it would necessitate the accurate measurement of extremely small surface pressures in a region of low surface concentration, where unavoidable contamination introduces an increasing uncertainty in such measurements.
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