METHOD FOR ANALYSIS OF VINYL TYPE TERPOLYMER

PURPOSE:To enhance the measuring accuracy of the compositional ratio of a vinyl type terpolymer, by correcting a measured value by using correction coefficient prescribed by forming ratios M2/M1 and M3/M1 of constitutional monomers M1, M2, M3 formed by thermal decomposition. CONSTITUTION:At first, a terpolymer having a known compositional ratio is measured by pyrolytic gas chromatography and the relation between two sets of forming ratios M2/M1, M3/M1 of formed monomers M1, M2, M3 and correction coefficient is calculated at three points Ha, Hb, Hc on a plane P. Next, unknown terpolymer is measured by pyrolytic gas chromatography and the mol ratio X of the forming ratio M2/M1 and the mol ratio Y of the forming ratio of M3/M1 of the formed monomers M1, M2, M3 and a point Pxy where the line parallel to the correction coefficient axis on the intersection (X, Y) thereof crosses the plane P is calculated to obtain correction coefficient. By this method, the composition of the terpolymer can be accurately known from the relation between the correction coefficient and the ratios of monomer quantities.