ISSN 1070-4272. Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 5, pp. 733 735. Pleiades Publishing, Inc., 2006.Original Russian Text E.E. Ergozhin, K.I. Imanbekov, 2006, published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 5, pp. 744 746.
SORPTION AND ION-EXCHANGE PROCESSES
Ion Exchangers Based on Homo- and Copolymersof Vinyloxyethylamine and Glycidyl Methacrylate
E. E. Ergozhin and K. I. ImanbekovBekturov Institute for Chemical Science, Ministry of Education and Science of Kazakhstan Republic,
Received October 4, 2005; in final form, February 2006
AbstractAn efficient method is developed for synthesis of highly permeable ion-exchange resins throughthe reaction of glycidyl methacrylate with polyvinyloxyethylamine and its copolymers with nitrogen-contain-ing monomers with preservation of the nitrogen functional groups in the latter monomers. The synthesis condi-tions are optimized, and physicochemical and sorption properties of the resulting polymers are examined.
Polyvinyloxyethylamine (PVOEA, monoethanol-amine polyvinyl ether) and its copolymers with2-methyl-5-vinylpyridine (2M5VP), 4-vinylpyridine(4VP), and N-vinylpyrrolidone (NVP), containingreactive and complexing functional groups, representa particular class of water- and organo-soluble poly-mers [1, 2]. The presence of the VOEA units with pri-mary amino groups in the structure of such homo- andcopolymers provides high reactivity in polycondensa-tion with epoxy compounds (no need in additionalhardeners like di- and polyamines), thus allowingmaintenance of the complexing capacity of the tertiarynitrogen atom of the pyridine and lactam rings.
In this study we synthesized the polyfunctional ion-exchange resins by the reaction of glycidyl methacryl-ate (GMA) with VOEA homo- and copolymers con-taining the pyridine and lactam rings and charac-terized their properties.
Glycidyl methacrylate, VOEA polymers, and its co-polymers with N-vinylpyrrolidone and vinylpyridines(VOEANVP, VOEA4VP, and VOEA2M5VP;VOEA : vinylpyridine = 25 : 75 mol/mol) were syn-thesized by the standard procedures .
Polycondensation of GMA with homo- and copoly-mers of VOEA was carried out in DMF in a three-necked flask equipped with a mechanical stirrer, athermometer, and a dropping funnel. The mixture wasstirred with heating to the onset of gelation. Then thegel was transferred into a porcelain bottle and curedat 60120C under argon. The subsequent processing
of the polymers and their physicochemical charac-terization were performed by the standard methods[5, 6].
The static sorption of the copper ions was studiedby the separate portion method. Potentiometric titra-tion was carried out on an OR-265 digital pH-meterat 25C. The stock solution was prepared from coppersulfate (analytically pure grade). The ionic strengthof the solution () was varied by adding Na2SO4.The IR spectra of the as-prepared polymers and metal-containing samples were recorded on UR-20 andSpecord spectrophotometers using the KBr technique. The potentiometric titration was performed usingthe separate portion method .
To optimize the synthetic route, we studied the ef-fects of the component ratios and curing temperatureand time.
We found that the characteristics of the final prod-ucts are influenced to a greater extent by the startingreagent concentrations and the nature of VOEA poly-mers (Table 1). In all cases, the static exchange capac-ity (SEC) and nitrogen content in the resins increasedwith increasing concentration of VOEA or its copoly-mer in the initial mixture. The SEC of the anion ex-changers is largely controlled by the nature of theVOEA polymer. The exchange capacity of the poly-electrolytes based on homo- and copolymers of VOEAincreased in the order PVOEA < VOEA4VP