| abstract |
The invention relates to a method for preparation of hydrophilic anion exchangers from gels based on crosslinked copolymers of hydroxyalkyl acrylates and methacrylates, oligo- and polyglycol monoacrylates and monomethacrylates, hydroxyalkylacrylamides or hydroxyalkylmethacrylamides with crosslinking comonomers containing 2 or more acrylcyl or methacryloyl groups in the molecule, as alkylene, oligo- and polyglycol diacrylates and dimethacrylates or divinylbenzene, which gels may have the homogeneous, heterogeneous or macroporous character. The hydroxyl groups of the initial hydrophilic gel are modified by the reaction with halogenoalkylamines, halogenoalkylammonium compounds, epoxyalkylamines and epoxyalkylammonium compounds or with compounds having several reactive groups in the molecule, as epichlorohydrine, di- and polyepoxides, di- and polyisocyanates, halogenoalkylepoxides, epoxyalkylamines and phosgene, and the subsequent reaction with compounds rendering anion-exchanging groups, as hydroxyalkylamines, diamines and their ammonium compounds. The later procedure may be carried out in one step. The hydroxyl groups of the initial gel can be also substituted by halogens and transformed into quaternary ammonium compounds by reaction with amines. All reactions may be performed also with gels combining alkoxide instead of hydroxyl groups. |