Grafting of 2-(Dimethylamino)ethyl Methacrylate onto Potato Starch Using Potassium Permanganate/Sulfuric Acid Initiation System

Abstract

Graft copolymerization of 2-(dimethylamino)ethyl methacrylate onto potato starch was carried out in an aqueous medium using a potassium permanganate/sulfuric acid initiation system. The grafting percentage and grafting efficiency were determined as functions of the concentrations of potassium permanganate, sulfuric acid and the monomer, and also polymerization temperature and time. The IR spectrum of the graft copolymer showed the peaks characteristic of the grafted chains. The grafting percentage and grafting efficiency increased and then decreased with increasing the concentrations of potassium permanganate, sulfuric acid, and the monomer, as well as polymerization temperature. The grafting reaction was characterized by an initial fast rate followed a lower rate which leveled off after a certain time. The overall activation energy for the grafting was estimated to be 66.9 kJ/mol.

Synthesis and Thermal Degradation of a Novel Starch Graft Copolymer Incorporating a Sulfobetaine Zwitterionic Monomer

“…So far many neutral monomers such as acrylamide, methyl methacrylate, vinyl alcohol, styrene, acrylonitrile, butadiene and vinyl acetate; anionic monomers such as acrylate and 2-acrylamido-2-methyl-1-propanesulfonate, sodium styrenesulfonate; and cationic monomers such as 2-hydroxy-3-methacryloyloxypropyltrimethyl ammonium chloride, dimethyldiallylammonium chloride, and 2-dimethylaminoethyl methacrylate have been grafted onto various starch substrates [1][2][3][4][5][6][7][8][9][10][11]. These graft products find many different applications and hold industrial promise for the future.…”

“…The IR spectrum of the graft copolymer did not only show the characteristic absorption bands of potato starch [3] but also the characteristic bands of the carboxylic ester carbonyl group at 1725 cm -1 , the sulfonyl group at 1062 cm -1 , and the quaternary ammonium groups at 938 cm -1 . This fact indicates that the sulfobetaine zwitterionic monomer, DMAPS, has been grafted onto the potato starch.…”

Studies on graft copolymerization of 3-acrylamidopropyl trimethylammonium chloride on pullulan

“…Based on the slopes of the Arrhenius plot, the activation energy for the graft copolymerization of APTAC onto pullulan backbone was found to be 42 kJ/mol. Similar values for the overall activation energy for the grafting of 4-vinylpirydine onto carboxymethylated cotton (Leza, Casinos, & Guzman, 1989), 2-(dimethylamino)ethyl methacrylate onto starch (Zhang & Chen, 2001) were obtained.…”

Graft copolymerization of N‐vinyl‐2‐pyrrolidone onto sodium carboxymethylcellulose with azobisisobutyronitrile as the initiator

“…Similar results have been obtained by many workers who have studied graft copolymerization. [18][19][20][21] Zhang and Tan 19 studied the graft copolymerization of 2-(dimethylamino)ethyl methacrylate onto carboxymethylated cellulose and reported that the grafting parameters increased with an increase in the temperature up to 358C and then decreased up to 608C.…”