9) Preliminary results in our laboratory (by T. Ougizawa et al.). (10) Note that the annealing conditions are identical with those of the longest case in Figure 4, at which the scattering peak has disappeared.

SynopsisConstants for the Mark-Houwink-Sakurada relation can be established in principle from GPC measurements on broad distribution polymers. The method requires use of two samples with dif- on the GPC measurement of Vn. The simplest and safest way to use GPC data to estimate the MHS constants involves the measurement of GPC chromatograms of two polymer samples with different intrinsic viscosities. The method is not confined to the solvent used as the GPC eluant. The MHS constants derived from GPC appear to reflect the molecular weight range of the calibration samples and may not be as widely applicable as those from the more tedious classical methods which employ a series of fractionated samples.

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