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Abstract

Spectral and microscopical data revealed effects of 23% NaOH used either as a pretreating agent (catalyst) or as a mercerizing agent prior to or subsequent to treatment of cottons with CCl₄ solutions of butadienediepoxide (BDO) in presence of more dilute NaOH catalysts. Whereas high dry and high wet wrinkle-recovery angles resulted when 2% or 15% NaOH catalyzed the BDO-cellulose reaction, only high wet recoveries were obtained with 23% NaOH catalysis. Conditioned recovery angles were higher, the weaker the base pretreatment. Postmercerization did not change recoveries of BDO- native cottons catalyzed by 15% NaOH but adversely affected dry angles of BDO-treated fabrics catalyzed with 2% NaOH and wet angles of those fabrics from reactions catalyzed by 23% NaOH. BDO-native cotton fabrics under 2% base catalysis retained the cellu lose I lattice; those under 15% NaOH catalysis exhibited mixed cellulose I- and II-type lattices, and those under 23% base catalysis consisted of mixed cellulose II- and III-type latices. Postmercerization resulted in (1) a cellulose IV-type lattice from BDO-treated fabrics which originally retained the native cellulose I structure, (2) a mixed cellulose II and IV-type lattice for those which originally possessed the mixed cellulose I- and II-type structure, and (3) no further effect upon those which originally possessed a mixed cellulose II and III-type structure. ,

Mercerized fabrics (mixed cellulose I and II) pretreated with aqueous NaOH and then reacted with BDO exhibited high dry and high wet wrinkle-recovery angles only when 2% NaOH catalyzed the reaction, and then only when add-ons of BDO were ex tremely high (35%). Otherwise, dry recovery remained essentially that of the mercerized control, and only high wet recoveries were obtained. Comparisons of fabric properties of BDO-mercerized cottons were made with those of the BDO-native cottons.

Only with 23% NaOH pretreatment did comparable products from BDO-native cotton and BDO-mercerized cotton reactions have the same lattice type and show a tendency toward a cellulose III-type lattice. Microscopical and spectral data indicate the mixed I and II lattice was retained in all BDO-mercerized cottons pretreated with 2% NaOH and in all cottons pretreated with 15% NaOH or 23% NaOH and reacted to low add-ons of BDO. Postmercerization of these BDO-mercerized fabrics converted the cellulose I lattice to a II rather than to a IV-type lattice as occurred in BDO-native cottons. With those fabrics of high BDO add-ons postmercerization changed the cellu lose II-type lattice to a cellulose III lattice.

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Effect of Mercerizing- Strength NaOH on Fine Structures of Cottons Modified with Butadienediepoxide

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