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Acid anhydrides, detection identification

In the characterization of alkyd resin formulations the palmitic acid to stearic acid (P/S) ratio, often used to identify the type of oil in a binder, cannot be applied as many different oils other than the traditional ones are commonly employed in industrial formulations. Moreover, they are often in mixtures, with the additional complication that fatty acids are also sometime added to the vegetable oils, thus making it impossible to rely on measured P/S values. In any case it is important to always derivatize the samples if Py-GC/MS is used and an alkyd is suspected. Phthalic anhydride will be detected also in an underivatized alkyd pyrogram however, isophthalic acid will not, leading to confusion and the possibility of uncorrected identification [92]. [Pg.356]

Most methods for the determination of carboxyl groups in polymers are based on titration techniques including, for example, the following copolymers acrylic acid - itaconic acid [29], acrylic acid - ethyl acrylate [30] and maleic acid-styrene [31]. High-frequency titration has been applied [32] to the analysis of itaconic acid - styrene and maleic acid - styrene copolymers and ethyl esters of itaconic anhydride - styrene copolymers. The method can also be used to detect traces of acidic impurities in polymers and in the identification of mixtures of similar acidic copolymers. Titration indicates that the acid segments in the copolymers of itaconic acid - styrene and maleic acid - styrene, and the homopolymer polyitaconic acid, act as dibasic acids. The method has a sensitivity that permits identification and approximate resolntion of two carboxylate species in the same polymer, for example ... [Pg.141]


See other pages where Acid anhydrides, detection identification is mentioned: [Pg.206]    [Pg.318]    [Pg.269]    [Pg.261]    [Pg.119]    [Pg.303]    [Pg.57]    [Pg.784]    [Pg.115]    [Pg.30]    [Pg.44]    [Pg.230]    [Pg.234]    [Pg.849]    [Pg.149]   
See also in sourсe #XX -- [ Pg.269 ]




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