Temperature-stepped vaporization coulometry isolates physical water desorption from catalytic transesterification to ensure accurate low-ppm moisture determination.
Desorption testing above 160 C triggers solid phase transesterification, generating chemical water that falsifies polyester moisture readings and causes under-drying.
Coulometric vaporization titration under ISO 15512 Method B2 quantifies trace moisture in industrial polyesters to prevent hydrolytic degradation during melt extrusion.
Dynamic carrier gas velocity sweeps separate trace moisture from catalyst-driven transesterification side-products during coulometric vaporization.
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