synopsisA method is proposed for use of the universal calibration curve, i.e., the product of molecular weight and intrinsic viscosity versw retention volume, in calculating the molecular weight distribution of a polymer from gel-permeation chromatography (GPC) when the Mark-Houwink relation of the polymer in the solvent used for the GPC is unknown. This is achieved by measuring the viscosity of each fraction with an automatic capillary tube viscometer. Application of this technique to poly(viny1 chloride) and poly(viny1 acetate) proved to be successful.
J . P o l~t n .Sci. A-2, 5,313 (1967).
The numerical treatment of a chromatogram to obtain the various molecular weight averages i s discussed. The method used by Cooper and Matringer to calculate the influence of the number of data points on Mn and M, i s criticized. Another model function i s proposed. Calculations then show that the results obtained for Mn, r\2v and 4 are apprwching the theoretical values more and more by increasing the number of data points as i t should be expected. This i s i n contradiction with the results of Cooper and Matzinger. The influence of the base-line correction i s evaluated too.
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