Graft Copolymerization Of Ethyl Methacrylate Research Articles

Evaluation of Thermal Behavior of Microwave Induced Graft Copolymerization of Ethylmethacrylate onto Soy Protein Concentrate

Graft copolymerization of ethylmethacrylate (EMA) onto soy protein concentrate (SPC) was carried-out using ascorbic acid/potassium persulphate as redox initiator under microwave radiations. Different reaction parameters like reaction time, solvent amount, initiator ratio, pH and monomer concentration were optimized to get maximum graft yield (78.8%). The graft copolymer formed was characterized by FTIR, XRD, SEM, TGA, DTA and DTG techniques. Graft copolymer showed higher moisture resistance along with increased chemical and thermal stability. TGA, DTA and DTG studies could reveal the distinctive features of graft copolymerization of EMA onto S-S linkages of soy protein concentrate under the influence of microwave irradiations in addition to grafting at peptide linkages, which were further supported by FT-IR studies.

Grafting onto wool. XXX. Effects of solvent composition on the radiation-induced graft copolymerization of some acrylates onto wool fiber

Radiation-induced graft copolymerization of ethyl methacrylate (EMA), ethyl acrylate (EA), methyl acrylate (MA), and methyl methacrylate (MMA) onto wool fiber by mutual method has been studied as a function of the composition of water-alcohol medium. Grafting of EMA, EA, and MA has been studied in nitrogen atmosphere, whereas grafting of MMA was carried out in air. Percentage of grafting (Pg) has been determined as a function of different reaction parameters that influence graft copolymerization. For all the monomers studied, it is observed that (1) maximum grafting is obtained at an optimum composition of water-alcohol medium; (2) Pg is considerably less in pure water or alcohol; (3) Pg of MA falls more sharply on addition of larger amount of MeOH to water-methanol medium as compared to EA and EMA; (4) in the case of grafting of MMA, water-isopropanol is a better reaction medium than the water-ethyl alcohol; and (5) Pg decreases considerably in air for all the monomers studied. A suitable explanation is suggested to account for these observed trends.

Grafting onto wool. XXX. Effects of solvent composition on the radiation‐induced graft copolymerization of some acrylates onto wool fiber

Radiation-induced graft copolymerization of ethyl methacrylate (EMA), ethyl acrylate (EA), methyl acrylate (MA), and methyl methacrylate (MMA) onto wool fiber by mutual method has been studied as a function of the composition of water-alcohol medium. Grafting of EMA, EA, and MA has been studied in nitrogen atmosphere, whereas grafting of MMA was carried out in air. Percentage of grafting (Pg) has been determined as a function of different reaction parameters that influence graft copolymerization. For all the monomers studied, it is observed that (1) maximum grafting is obtained at an optimum composition of water-alcohol medium; (2) Pg is considerably less in pure water or alcohol; (3) Pg of MA falls more sharply on addition of larger amount of MeOH to water-methanol medium as compared to EA and EMA; (4) in the case of grafting of MMA, water-isopropanol is a better reaction medium than the water-ethyl alcohol; and (5) Pg decreases considerably in air for all the monomers studied. A suitable explanation is suggested to account for these observed trends. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 191–195, 1997

Grafting Vinyl Monomers onto Nylon 6 Fiber. IV. Graft Copolymerization of Ethyl Methacrylate onto Nylon 6 Fiber by Photoirradiation

Abstract Grafting of nylon 6 fiber was carried out using ethyl methacrylate (EMA) as the monomer in various water-alcohol systems (i.e., water-methanol, water-ethanol and water-n-propanol; water-alcohol ratio 1:1) at 70°C using a carbon arc lamp as the source of photochemical initiation. Percent graft add-on (% GAO) increases continuously and linearly with an increase in monomer concentration irrespective of the media used. The % GAO, however, decreases with an increase in the alkyl chain length of the alcohol used in the following order: water-methanol > water-ethanol > water-n-propanol. With an increase in the time period of grafting, % GAO and total polymer yield (% TPY) increase continuously in all three media whereas the grafting efficiency (GE) first increases and then falls after reaching a maximum level. Although a similar trend is maintained in the three systems, there is a decrease in overall % TPY and % GAO from the water-methanol system to the water-n-propanol system through the water-ethanol system.