Graft copolymerization of methyl acrylate onto gelatin

The graft copolymerization of acrylonitrile (AN) onto Cassia tora gum (CTG) was carried out in an aqueous medium with a ceric ammonium nitrate (CAN)nitric acid initiation system. The percentage grafting and percentage grafting efficiency were determined as functions of the concentrations of CAN, nitric acid, AN, and CTG and the polymerization temperature and time. The results are discussed, and a reaction mechanism is proposed.

Section: Resultsmentioning

confidence: 99%

Graft copolymerization of acrylonitrile onto Cassia tora gum with ceric ammonium nitrate–nitric acid as a redox initiator

Sharma

Kumar

Soni

2003

“…The increase in percent grafting is accounted for by the increase in number of grafting sites in the initial stages of the reaction. 24 The leveling off of grafting with time could be attributed to a decrease in concentration for both initiator and monomer as well as to a reduction in the number of sites on the backbone accessible for grafting as the reaction proceeds.…”

Section: Effect Of Reaction Timementioning

confidence: 99%

Ceric ammonium nitrate‐initiated graft copolymerization of acrylamide onto Cassia tora gum

Sharma

Kumar

Soni

2002

Graft copolymerization of acrylamide onto Cassia tora gum was studied in an aqueous medium using ceric ammonium nitrate-nitric acid as the redox initiator. To optimize the reaction conditions for obtaining maximum percent grafting, the concentrations of Cassia tora gum, ceric ammonium nitrate, acrylamide, and nitric acid, time, and temperature were varied. Results are discussed and a reaction mechanism is proposed.

“…Graft copolymerization is one of the methods to improve the properties of the natural [1][2][3][4] and synthetic polymers. [5][6][7][8] When using graft copolymerization, it is a goal that the host polymer gains some of the desired properties of monomer(s) used for grafting.…”

Section: Introductionmentioning

confidence: 99%

Graft copolymerization of methyl methacrylate onto gelatin using KMnO₄‐H₂SO₄ redox system

Keleş

Saçak

2003

ABSTRACT:The graft copolymerization of methyl methacrylate onto gelatin was studied using KMnO 4 -H 2 SO 4 redox system. The maximum graft yield of 64.5% was obtained at the potassium permanganate concentration of 2.00 ϫ 10 Ϫ3 mol/L and the optimum temperature of 50°C. Activation energy was calculated as 18.6 kcal/mol at the temperature interval of 40 -70°C. The results of the thermogravimetric analysis showed that the degradation temperature of gelatin increased as a result of grafting. Moreover, some changes in the properties of methyl methacrylate-grafted samples were also observed.