Abstract
Various phthalates and aliphatic diesters were analysed by gas-liquid chromatography qualitatively and quantitatively.
Two columns of lower content liquid phase, such as 1.4% neopentylglycol sebacate or 1.2% SE-30 on Diasolid-M, were used in order to separate the esters having higher boiling points. By using the internal standard method, those esters were successfully separated and analysed quantitatively with considerable good accuracy.
The vapour pressures of several esters could be estimated from relative retention times (Rr) against the standard substances such as DEP or DOA. By inserting these values in Clausius-Clapeyron's equation, the latent heat values Δ H were calcurated. Rr was discussed in terms of activity coefficient r and latent heat ΔH. Consequently, the corrected Rr could be revealed only by the difference of Δ H between the samples and the standard substance, and was indifferent with the kind of columns.
