Graft copolymerization of starch-AN initiated by potassium permanganate

Abstract

ABSTRACT:The initiating ability of the potassium permanganate in the graft copolymerization of acrylonitrile onto starch was studied. The results indicate that the grafting parameters, such as concentrations of potassium permanganate, acrylonitrile, starch, and catalyst acids, all have significant effects on the graft copolymerization and the components of the graft copolymers, and this offers methods to adjust the properties of the graft copolymers. The sources of starch and corn starch derivatives both affected the components of the graft copolymers, which showed the influence of functional group on the grafting ability of starch. The preheat treatment and preoxidation of starch, as well as the adding sequence of the reactants all influenced the graft copolymerization, from which some suggestions about the grafting procession could be obtained.

An Insight To Pullulan: A Biopolymer in Pharmaceutical Approaches

“…The increase in weight of pullulan after grafting clearly indicates the grafting of concerned group on to pullulan. Gao et al characterized the graft yield, which is shown below [40]:…”

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

“…The increase in weight of the grafted pullulan over that of the pullulan, indicated the grafting of APTAC onto pullulan. The graft yields were characterized by the following parameters (Gao, Yu, Wang, Chang, & Tian, 1998):…”

Graft copolymerizaztion of methyl acrylate onto chitosan initiated by potassium diperiodatocuprate (III)

“…It is no doubt that its feasibility in polymerization inspires thought and research. Some achievements have been made, to date, on vinyl monomer polymerization and graft copolymerization initiated by supernormal valence transition metals, such as Mn (VII), Cr (VI), V (V), Ag (III), Cu (III), etc 1–4. Experiments have demonstrated Cu (III) is an efficient and cheap initiator in grafting methyl acrylate (MA) or methyl methacrylate (MMA) onto macromolecular structures, such as poly(acrylamide), nylon1010, and starch 5–7…”