Grafting of cellulose–thiocarbamate with vinyl monomers: Antimicrobial activity

Abstract

SynopsisGrafting of vinyl monomers onto cellulose-thiocarbamate was carried out using ceric ammonium sulfate (CAS) as a n initiator. The graft yield was found to depend on the amount of thiocarbamate groups, initiator, and monomer concentrations as well as temperature. The graft yield increased with increasing (CAS) concentration. The reactivity of vinyl monomers studied followed the order ethyl acrylate > acrylonitrile. A comparison between the graft yields obtained with the modified cullulose indicated that cellulose thiocarbamates having less than 1.1% nitrogen showed lower graft yields than the unmodified cellulose. Above this, cellulose thiocarbamate was much more amenable to grafting than the unmodified cellulose. The grafted cellulose thiocarbamates exhibited high antifungal activity and had no effect on gram-negative, gram-positive bacteria and yeast. The maximum wne of inhibition was obtained after grafting with 2 h which resulted in 43 and 50% add-on polymer in the cases of acrylonitrile and ethyl acrylate, respectively. Grafted cellulose thiocarbamates with acrylonitrile had higher potency for antifungal activity than that grafted with ethyl acrylate.

Utilization of lignin p‐aminophenyl carbamate as a coupler for dyeing wool and nylon

“…Lignin carbamates were prepared according the previous work. 3 One mole lignin carbamates were dissolved in acetone condensed with (1 mol) of p -nitroanalhe for 8 h to form lignin-p -aminophenyl carbarnate. Reduction was effected by impregnation of this new compound in a solution containing thiourea dioxide (0.25% ) and NaOH (0.25% ) at 80°C for 10 min using a liquor ratio of 1 : 50.…”

Preparation of antimicrobial sutures by preirradiation grafting of acrylonitrile onto polypropylene monofilament. III. Hydrolysis of the grafted suture

“…Currently available sutures do not have antimicrobial characteristics and, thus, it is necessary to modify these sutures in such a way that they not only retain inherent mechanical properties but also exhibit antimicrobial activity for prolonged periods, thus preventing bacterial infections in postoperative wounds. Considerable efforts have been made by different researchers to make antimicrobial polymers 6–12. This can be accomplished either by the addition of an antimicrobial agent to the polymer chips before extrusion6–8 or by coating a polymer with an antimicrobial agent 9–12…”

“…Considerable efforts have been made by different researchers to make antimicrobial polymers 6–12. This can be accomplished either by the addition of an antimicrobial agent to the polymer chips before extrusion6–8 or by coating a polymer with an antimicrobial agent 9–12…”