Cotton Fabric Bearing Cationic and β-Cyclodextrin Moieties: A Study of the Reaction Parameters

Cotton fabric bearing β-cyclodextrin and cationic moieties were prepared using different techniques and reaction conditions. Monochlorotriazinyl-β-cyclodextrin (R-CD) and 3-chloro- 2-hydroxypropyl trimethyl ammonium chloride (Quat-188) were employed to introduce the cyclodextrin ring and cationic group respectively to cotton cellulose. The first reaction technique that was studied involved the reaction of cotton fabric with R-CD, followed by the cationization of the treated fabric with Quat-188. In the second technique, cationized cotton fabric was allowed to react with R-CD. In the third technique, cotton fabric was reacted with RCD and Quat-188 simultaneously in one step. The factors affecting the extent of the reaction in each technique were investigated, including the concentration of alkali, the reaction temperature, the duration of the reaction, as well as the R-CD and Quat-188 concentrations. The extent of the reaction was monitored to determine the nitrogen content. The results obtained revealed that treating the cotton fabric with R-CD and Quat-188 causes the cotton fabric to have R-CD rings and that cationic group depends on the sequence of processes and reaction conditions. It was found that, at the same Quat-188 and R-CD concentrations, cationized cotton fabric display higher reaction efficiency with R-CD than that reported when R-CD treated cotton fabric was cationized using Quat-188. Moreover, no alkali is required to achieve the reaction between R-CD and pre-cationized cotton fabric, while the reaction of both R-CD and Quat-188 with cotton fabric requires the use of 30 g/l Na₂CO₃ and 35 g/l NaOH, respectively.