Dilute solution properties of poly(vinyl acetate). I. Molecular weight dependence of the limiting viscosity number in a few solvents

Abstract

Abstract Relationships between limiting viscosity number and molecular weight are reported for the systems poly(vinyl acetate) in acetone at 6 and 30°C, in chloroform at 6°C, and in the Θ‐solvent methanol at 6°C, in the molecular weight range from 3.5·10 3 to 1.5·10 6 using 24 narrow distribution fractions. Plots of [η] vs . M on a double logarithmic graph indicate that K and v in the K UHN ‐H OUWINK ‐S AKURADA equation are not constant for the good solvent systems. Neither the F LORY ‐F OX ‐S CHAEFGEN plot nor the STOCKMAYER‐FIXMAN plot gives straight lines. A new empirical relationship is proposed for [η] vs . M.