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Glycidyl methacrylate/monochlorotriazinyl-β-cyclodextrin mixture (GMA/MCT-β-CD) is grafted onto cotton fabric by an irradiation technique that uses linear electron beam…
Glycidyl methacrylate/monochlorotriazinyl-β-cyclodextrin mixture (GMA/MCT-β-CD) is grafted onto cotton fabric by an irradiation technique that uses linear electron beam radiation for initiating the grafting reaction. The obtained grafted fabric (cell-g-GMA/MCT-β-CD) is loaded with chlorohexidin diacetate (an antimicrobial agent) and subjected to several washing cycles. Grafted cotton fabrics (before and after loading with the antimicrobial agent) and control cotton fabrics are characterized for antimicrobial activity against different kinds of bacteria and fungi by using the diffusion disk method.
Grafted fabrics that are loaded with an antimicrobial agent show very good antimicrobial activity in comparison with control and grafted fabrics which are not loaded with an antimicrobial agent. The results in this study also demonstrate that GMA/MCT-β-CD grafted fabrics that are loaded with an antimicrobial agent retain a good deal of their antimicrobial activity after five washings. Good retention of antimicrobial activity is due to the cavities that are present in the cyclodextrin moieties which are used to host and keep the antimicrobial agent.
Cotton fabric bearing β-cyclodextrin and cationic moieties were prepared using different techniques and reaction conditions. Monochlorotriazinyl-β-cyclodextrin (R-CD) and…
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.
Linear electron beam radiation has been used to induce irradiation grafting of glycidyl methacrylate (GMA), glycidyl methacrylate/β-cyclodextrin (GMA/β-CD), and glycidyl…
Linear electron beam radiation has been used to induce irradiation grafting of glycidyl methacrylate (GMA), glycidyl methacrylate/β-cyclodextrin (GMA/β-CD), and glycidyl methacrylate/monochlorotriazinyl-β-cyclodextrin (GMA/MCT-β-CD) onto cotton fabrics. The effect of radiation dose, GMA concentration and CDs concentration on graft yield, epoxide content and the bonded amount of CDs was investigated. Results obtained reveal that the amount of CDs bonded within the fabric; the add-on and the epoxide content are directly related to the CDs concentration, GMA concentration and the irradiation dose. Graft yield and epoxide content increase with the increase of radiation dose to a certain extent, and they decrease due to degradation of GMA at higher irradiation doses. Results also reveal that although the bonded amount of CDs is nearly proportional to the concentration of CDs in the treatment solution, the accessibility ratio of CDs decreases with increasing CDs concentration. Treatment of fabrics grafted with GMA (Cell-g-GMA) and GMA/CDs mixtures (Cell-g-GMA/CDs) in a sequel step with the corresponding CDs increases the amounts of CDs fixed onto the fabrics, while epoxide content decreases. The treatment of the cotton fabrics with GMA and CDs was established on the basis of spectral data studies.