Flow injection analysis estimation of diffusion coefficients of pauci- and polydisperse polymers such as polystyrene sulfonates

Authors

  • William A. Boyle,

    1. Department of Chemical Engineering, BF-10, University of Washington, Seattle, Washington
    Current affiliation:
    1. Aquaculture and Food Science Division, HF-10, University of Washington, Seattle, WA 98195
    Search for more papers by this author
  • Richard F. Buchholz,

    1. Georgia-Pacific Corporation, Chemicals Division, Tacoma, Washington 98421
    Search for more papers by this author
  • John A. Neal,

    1. Georgia-Pacific Corporation, Chemicals Division, Tacoma, Washington 98421
    Search for more papers by this author
  • Joseph L. McCarthy

    Corresponding author
    1. Department of Chemical Engineering, BF-10, University of Washington, Seattle, Washington
    • Department of Chemical Engineering, BF-10, University of Washington, Seattle, Washington
    Search for more papers by this author

Abstract

Flow injection analysis, often used for determination of diffusion coefficients of nonpolymeric substances, has now been applied to the characterization of pauci- and polydisperse polymers in solution. A relative method was found useful for obtaining moderate quality evaluations of diffusion coefficients and related parameters of polymers. The width at half-height W1/2 of the trace peak is found to be proportional to the number average molecular weight n of pauci- and polydisperse polymers, allowing estimation of r and diffusion coefficients. For sodium polystyrene sulfonates at substantially infinite dilution in 1.0 g L−1 Na2SO4, a linear relation has been observed between the logarithms of the molecular weight n and the mean diffusion coefficient D in the n range of 1000–90,000 g mol−1 or the D range of 30 × 10−7 to 2 × 10−7 cm2 s−1.

Ancillary