Oxidative chemical polymerization of aniline was carried out using peroxydisulphate and peroxomonosulphate as a lone initiator in an aqueous acidic medium in the presence of Rayon fiber. The Rayon fiber was tested for the chemical grafting of polyaniline onto it. The content of polyaniline (wt %) in the backbone was found to vary while varying the [M], [I], and (amount of Rayon fiber) during the polymerization of aniline. Various graft parameters like rate of grafting, % grafting, and % efficiency were calculated. Rate of homopolymerization was also followed for both cases. The chemical grafting was confirmed using FTIR spectroscopy, cyclic voltammetry, weight loss study, and conductivity measurements. Probable mechanism has been proposed to explain the experimental results obtained.

ABSTRACT:The chemistry of free-radical graft copolymerization initiated with peroxomonosulfate (PMS)-thioglycolic acid (TGA) redox system has been investigated by using 4-vinyl pyridine (4VP) as a model for nylon 6 fiber in aqueous solution under nitrogen atmosphere. Effects of concentration of 4VP, PMS, TGA, nylon 6, time, and temperature on R h and graft parameters were studied. The FTIR spectrum of nylon 6-g-4VP was reported. Water retention capacity (WRC) of the grafted fiber was tested.

Acrylic acid and acrylamide were polymerized by a peroxydisulfate-suberic acid redox system under a nitrogen atmosphere both in the presence and in the absence of ultrasound (at constant frequency). The rate of polymerization was determined for different concentrations of monomer, initiator, and activator and for different percentages of ultrasonic intensity. The polymers were characterized by X-ray diffraction and 1 H-NMR spectroscopy. A probable mechanism is proposed to explain the experimental results obtained.

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