Abstract
In pursuit for new reactive materials designed for synthesis of functional resins, the novel core-shell type polymeric supports with accessible chloromethyl groups were synthesized. The commercial Amberlite XAD-4 adsorbent was impregnated with different mixtures of vinylbenzylchloride and divinylbenzene, that were further polymerized in the structure of the polymer carrier. The syntheses have been evaluated by recording FT-IR spectra, capturing SEM micrographs as well as analyzing the sorption and desorption of nitrogen at 77 K. The amount of the introduced functionalities has been estimated by chlorine content determination. Based on the obtained results, the reactive chloromethyl groups were successfully introduced into XAD-4 structure. Captured SEM micrographs revealed that VBC/DVB copolymer has covered initial polymeric matrix of XAD-4 adsorbent. Based on the results we have determined conditions of the synthesis that allow us to receive that effect.
Highlights
The most popular supports for preparation ofion-exchange resins are various types of polystyrene (S) and divinylbenzene (DVB) copolymers
The copolymerization process is followed by introduction of reactive sites into polymer structure using bis-chloromethyl ether (BCME) as an alkylating agent.[2]
The aim of the present work is an evaluation of a procedure of synthesis of new polymeric supports designed for synthesis of new functional resins
Summary
The most popular supports for preparation ofion-exchange resins are various types of polystyrene (S) and divinylbenzene (DVB) copolymers. A preparation of that type of materials requires in a first step, copolymerization of styrene (S) and divinylbenzene (DVB) to form a crosslinked suspension copolymer, S/DVB. The method allows to obtain a material with transverse, very durable covalent bonds resulting with polymeric beads that are resistant for any kind of chemical environment.[1] Usually, the copolymerization process is followed by introduction of reactive sites (chloromethyl groups) into polymer structure using bis-chloromethyl ether (BCME) as an alkylating agent.[2]. The procedure has its disadvantages, including extent of methylene binding (reaction of a chloromethylated ring with a benzene ring) which occurs during chloromethylation, influencing the final properties of the S/DVB resins.[3] the strongly carcinogenic character of the BCME creates a pressing need for creating materials that could be equivalent to chloromethylated S/DVB copolymers.[4]
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