Three poly(vinyl chloride) (PVC) samples were fractionated by a preparative-scale GPC (gel-permeation chromatography) with Styragel. The carrier solvent used was tetrahydrofran. The fractionation of one sample whose average molecular weight was the lowest among the three samples was not affected much by the injected sample concentration and all the fractions obtained gave fairly narrow distributions of molecular weight. The fractionation of the remaining two samples having higher average molecular weights showed an overload effect and the polydispersity of each fraction of these samples was greater than that of the former sample. The relationship between the intrinsic viscosity and weightaverage molecular weight for PVC fractions revealed that the fractions of the latter two samples contained long chain branches. The GPC calibration curve for the hydrodynamic volume of PVC agreed with that of the polystyrene standards in the low molecular-weight range, but not in the high molecular-weight range where the effect of chain branching was dominant. KEY WORD Preparative Scale GPC I Poly(vinyl chloride) I Tetra
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