Study On Radical Polymerzation Of Redox Initiated With Potasium Ditelluratocuprate

This paper has reported a study on homopolymerization and graft copoly-Merization of redox initiated with potasium ditellruatocuprate(DTC) and was discussed in three sections.In the first chapter, on the one hand, the development and the present research situation of DTC as well as the graft copolymerization of casein, starch and chitosan using DTC as radical initiator were cited and elaborated; on the other hand, it was set forth that employing this novel initiator of DTC to initiate the homopolyerization of acrylamde(AM) and graft copolymerization of methyl methylacrylate(MMA) monomer onto natural macromolecules, such as casein, starch and chitosan, have important current and theoretical significance.Secondly, the redox system made up of DTC- AM initiate homopolymerzation of AM in aqueous alkaline medium. The results indicate that the equation of the polymerization rate (Rp) is as follows: Rp=k[AM]1633 [DTC]0.61 and that the overall activation energy of AM polymerization is 26.0kJ/mol, the polymer molecular weight decreases with the increasing [DTC] and increases with the increasing [AM]. The effects of various reaction conditions on the polymerization rate were also studied and consistent with the general rule of free radical polymerization. The initiation mechanism was proposed and verified by Fourier transform infrared (FTIR) and !H nuclear magnetic resonance; At the same time, DTC- casein, DTC-starch and DTC-chitosan were employed to initiate the graft copolymerization of MM A onto casein, starch and chitosan macromolecules backbone. The grafting parameters have been determined as a function of temperature, time, pH, concentrations of monomer, macromolecules backbone and initiator. The structure of the graft copolymers was confirmed by FTIR, scanning electron microscope (SEM), X-ray diffraction, and thermogravimetric analysis (TGA). Furthermore, single-electron-transfer mechanism produced in Cu(III) æ¡Ÿu(II) was tested to initiate the graft copolymerization of casein, starch and chitosan.Finally, potassium diperiodatonickelate(IV))-polyamide 6 redox intiation system was employed to initiate the grafting copolymerization of MMA onto nylon6. And then, the copolymers were used as the compatiblizer between nylon6 and PP, and PMMA.