Reactivity of functional groups in surface coating polymers. Part I. Hydroxyl groups in alkyd resins

Abstract

SynopsisThe factors which can influence the availability of functional groups in polymers are considered. In particular, the importance of hydroxyl groups in the formation and film-forming reactions of alkyd resins is discussed, and evidence is presented to suggest that the number of hydroxyl groups available for chemical reaction is not necessarily equivalent to the theoretical value. Factors which influence the availability of the hydroxyl groups are considered, and some of the properties of the alkyd are related to the available hydroxyl content.

Synthesis of polyesters as binders for deinkable inks. II. Kinetics and mechanism of polyesterification betweeno-phthalic anhydride and neopentyl glycol in bulk at 200�C

“…On the other hand, the neopentyl glycol dies-sions. However, the volumetry furnishes a higher degree of self-confidence than do the above afore-ters ee, estimated by 13 Figure 7.…”

“…ages of the monoesterified diols, i.e., of free {OH Thus, the free alcoholic groups {CH 2 OH from groups from the compound (III) and in structures the dialcohol, aa (free diol, II) were estimated by of the EE/ea type: 13 C-NMR from the area of the signals of the free oxymethylenic groups, the quaternary carbon, and the geminal methyl groups. The average value of these three determinations is shown in the second column of Table VI.…”

“…This fact is easily explainable if taken into account are the limits of sensibil- 13 C-NMR, we also carried out an indirect measurement of the {COOH groups by using 1 H-ity and, especially, the relative errors of the 13 C-NMR for samples obtained at high degrees of con-NMR spectroscopy as a primary technique, since we need a higher accuracy in the quantification, version with a low content of acid groups. Therefore, because of the limits of detection of namely, lower than 2%, to carry out a very precise kinetic analysis of the process.…”

“…The area of the signals was caldures, have shown that some polyesters are not culated by planimetry and triangulation. true solutions, [13][14][15] and for this reason, they do not fulfill one of the basic requirements of the theory of Flory. Volumetry 13 C-NMR spectroscopy was employed in a previous article 16 to analyze the structures formed For the experimental determination of the numduring the polyesterification in bulk at 200ЊC beber of acid groups by volumetry, we took 1 or 2 g tween o-phthalic anhydride and neopentyl glycol.…”

Preparation and characterization of ketonic polymer for coating applications

“…Hydroxyl content in a polymer is also an important characteristic to analyze the degree of polymerization. The reactivity of the hydroxyl group plays a vital role on film formation properties of a resin [18].…”