Anion-Exchange Cottons Prepared from Sodium Cellulosate1

Abstract

Sodium cellulosates containing from 0.5-1.9 mequivs of Na+ per gram of fabric were prepared by reacting cotton in methanolic solutions of sodium methoxide. The sodium cellulosates were reacted with β-chloroethyldiethylamine in t-butanol to form diethylaminoethyl (DEAE) cottons of greater than 1.0% nitrogen. These DEAE -cottons, easily pre pared at room temperature, were readily converted to the quaternary-base cellulose anion exchangers. Quaternary-base anion exchangers of lower capacity were prepared by reacting sodium cellulosates with glycidyltrimethylammonium chloride. Anion exchangers prepared in nonaqueous media did not differ in fabric properties from anion exchangers of similar capacities prepared in aqueous media. Ability of amino groups to catalyze cellulose-epoxide reactions was not significantly different in DEAE-cottons prepared in nonaqueous and in aqueous media.

Electron spectroscopy (ESCA) for analysis of cellulose anion exchangers

“…Diethylaminoethylated (DEAE) cotton was prepared in the absence of water by reacting cotton with sodium methoxide in methanol to form the sodium salt of cellulose. This was then reacted with 2-chloroethyldiethylamine in tertiary butanol (5,6). The product was washed in methanol and air-dried.…”

“…Diethylaminoethyl (DEAE) cottons have been prepared in aqueous (1)(2)(3)(4) and nonaqueous (5,6) media. These modified celluloses have been used as anion exchangers (7,8), and as substrates (9)(10)(11) for further chemical reactions that are catalyzed by the in situ amino groups.…”

“…DEAE-cotton is usually prepared by reacting cotton with 2-chloroethyldiethylamine or its hydrochloride in the presence of base (1)(2)(3)(4)(5)(6). With sodium cellulosate and the chloroalkylamine in nonaqueous media, the principal product (I) contains tertiary amino groups.…”

Chemical Modification of Anion-Exchange Cottons with Propane Sultone

“…Cotton with primary amine characteristics is called aminized cotton and cotton with tertiary amine characteristics is called diethvlaminoethyl cotton or I)EAE-cotton. DEAE-cotton was prepared from sodium cellulosate [1,11] by a completely nonaqueous procedure and stored in 1-butanol for subsequent use. Carboxymcthylcdlulose was also prepared [10~.…”