Cotton Cellulose In Presence Research Articles

Crosslinking of cotton cellulose in presence of alkyl di‐allyl ammonium salts. III. Study on pore structure of treated fabrics from dyeing kinetics

AbstractTwo kinds of alkyl di‐allyl ammonium salts (alkyl groups = methyl and propyl) as crosslinking agents are combined with dimethyloldihydroxyethyleneurea (DMDHEU) to study rate constants, structural diffusion resistance constants, and other parameters of dyeing. The dye absorptions for the various crosslinking agents are ranked DMDHEU–propyl di‐allyl ammonium salt > DMDHEU–methyl di‐allyl ammonium salt > DMDHEU, and the equilibrium absorption values are ranked DMDHEU–propyl di‐allyl ammonium salt > DMDHEU–methyl di‐allyl ammonium salt > DMDHEU. The dyeing rate constants and structural diffusion resistance constants of the finished fabrics are in the order DMDHEU–methyl di‐allyl ammonium salt > DMDHEU–propyl di‐allyl ammonium salt > DMDHEU; however, the activation energies are ranked inversely. The treated fabrics for DMDHEU–alkyl di‐allyl ammonium salts have a larger pore structure than those for DMDHEU. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 862–866, 2005

Chemical modification of cotton through reaction with alkoxy adducts of acrylamide and hexahydro‐1,3,5‐triacryloyl‐s‐triazine in nonaqueous medium

Abstract(β‐Alkoxypropionamide as well as hexahydro‐1,3,5‐x(β‐alkoxypropionyl)‐y(acryloyl)‐s‐triazine in nonaqueous medium were prepared. The products so obtained were reacted with cotton cellulose in nonaqueous medium under a variety of conditions. It was postulated that β‐methoxypropionamide reacted with cotton cellulose in presence of an acid catalyst via a substitution reaction. Reaction of hexahydro‐1,3,5‐mono(β‐alkoxypropionyl)‐diacryloyl‐s‐triazine with cotton cellulose also proceeded mainly through a substitution reaction. Addition and/or polymerization reaction, which entailed saturation of the double bonds of the acryloyl groups, occurred when the chemical modification of cotton was carried out at high temperature (above 130°C) for more than 10 minutes using higher concentrations of hexahydro‐1,3,5‐mono(β‐alkoxypropionyl)diacryloyl‐s‐triazine (8% or more)).

Accelerated oxidation of cotton cellulose in presence of reducing substances—Part III

(1) The measurement of oxidation potential of dilute solutions of sodium hypochlorite has been carried out at 30° C. by a method used successfully by various investigators. (2) The values of the oxidation potential at 30° C. are higher than those at 20° C. The differences in the potentials become more and more marked with reduction in the pH of the hypochlorite solution. (3) A correction of pH × 0·06 volts to the measured potentials at 30° C. does not show any maximum value over the pH region examined. A sharp change in the direction of pH-corrected oxidation potential curve, however, occurs at about the same pH at which a maximum is obtained at 20°C. (4) There exists no similarity between the corrected oxidation potential-pH curve at 30° C. and a curve showing relation between oxygen uptake or fluidity and pH at 30° C. Nabar, Scholefield and Turner1 had shown a striking resemblance between these curves at 20° C.

Accelerated oxidation of cotton cellulose in presence of reducing substances—Part II

Accelerated oxidation of cotton cellulose in presence of reducing substances—Part II

Accelerated oxidation of cotton cellulose in presence of reducing substances—I

Accelerated oxidation of cotton cellulose in presence of reducing substances—I

Accelerated Oxidation of Cotton Cellulose in Presence of Reduced Cibanone Orange R

THE rate of oxidation of cellulose by dilute solutions of sodium hypochlorite has been shown to be accelerated if certain vat dyes are also present in the reduced form upon the fibre1,2. Ferrous hydroxide precipitated on cellulose exerts a similar influence on the rate of oxidation3. The mechanism of this acceleration is not yet clear. It has been suggested2 that the difference between the oxidation potential of the oxidizing agent and the reduction potential of the vat dye may be the determining factor in the acceleration of the oxidation. The present investigation deals with the measurement of reduction potentials of vat dyes upon the fibre and their influence on the acceleration of the rate of oxidation of the cellulose substrate by dilute sodium hypochlorite solution.