Analysis of Polyester Resins by Gas Chromatography.

Abstract

Condensation of microliter quantities of alcohols and subsequent reaction with isocyanates gave quantities of urethans which could be detected and identified on paper chromatograms, even when the sample of alcohol was too small or too impure for the determination by infrared analysis. CONCLUSIONSBoth o-nitrophenyl-and p-phenylazophenylurethans give paper chromatographic separation of alcohols of various classes, with the o-nitrophenylurethans giving the best results. In addition, o-nitrophenylisocyanate reacts well with microquantities of alcohols to give enough derivative for paper chromatographic analysis, making this technique an effective supplement to gas liquid chromatography.LITERATURE CITED (

Selection of optimum position for measuring widths of chromatographic peaks with minimum error in area

“…The number of replications of any single measurement was smaller than in the previously reported series of measurements (2) but the results agreed at least semiquantitatively with Figure 1. The detailed values are given elsewhere (5).…”

“…The method is applicable to 0.05-to 0.2-gram samples and has a relative error in accuracy of 10%. Similar techniques for identifying carboxylic acids in plasticizers, in polyesters fibers, and in alkyd coating resins have been described (3)(4)(5). In these techniques, isophthalic, terephthalic, adipic, and sebacic acids have been recovered and converted to methyl esters from their products via transesterification with sodium methoxide and separated by gas chromatography.…”

Application of gas chromatography to qualitative and quantitative copolyamide analysis

“…The method is applicable to 0.05-to 0.2-gram samples and has a relative error in accuracy of 10%. Similar techniques for identifying carboxylic acids in plasticizers, in polyesters fibers, and in alkyd coating resins have been described (3)(4)(5). In these techniques, isophthalic, terephthalic, adipic, and sebacic acids have been recovered and converted to methyl esters from their products via transesterification with sodium methoxide and separated by gas chromatography.…”

Determination of Carboxylic Acids Present as Esters in Plasticizers and Polymers by Transesterification and Gas Chromatography

“…No quantitative results were presented by these workers, and the work was limited to alkyd and polyester coating resins. Percival (7) has extended this work to include semiquantitative results. The work was limited to polyester resins, and reaction times of 18 to 42 hours are required for transesterification.…”