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Study on Block Copolymerization Redox Initiated with Super Valence Trans-Metals

Author: BaiLiBin
Tutor: LiuYingHai
School: Hebei University
Course: Polymer Chemistry and Physics
Keywords: potassium diperiodatonickelate(Ⅳ) [Ni(Ⅳ)] potassium diperiodatocuprate(Ⅲ)[Cu(Ⅲ)] poly(ethylene glycol) poly(diethylene glycol Phthalic Anhydride) redox intiation block copolymerization acrylate monomers compatibilize
CLC: O631.5
Type: Master's thesis
Year: 2005
Downloads: 42
Quote: 0
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Abstract


This paper has reported the study of block copolymerization of acrylate monomers onto poly(ethylene glycol) (PEG)、 poly(diethylene glycol Phthalic Anhydride)(PPAG) redox initiated using potassium diperiodatonickelate(Ⅳ) [Ni(Ⅳ)]、 potassium diperiodatocuprate(Ⅲ)[Cu(Ⅲ)] as initators and was was discussed in three sections.In the first chapter, on the one hand, the development and the present research situation of Ni(Ⅳ)、 Cu(Ⅲ)、 as well as the block copolymerization of PPAG、 PEG were cited and elaborated; on the other hand, it was set forth that employing the above two kinds of super valence trans-metals to initiate the block copolymerization of acrylate monomers onto macromolecule, PPAG、 PEG , has important current and theoretical significance.Secondly, Cu(Ⅲ)—PPAG, Ni(Ⅳ)- PPAG were employed to initiate the block copolymerization of MMA and MA onto PPAG macromolecules backbone. From the Arrrhenius plot the act Ⅳation energy of MA、 MMA block with PPAG was calculated as 44.55 kJ/mol and 56.27 kJ/mol The blocking parameters have been determined as a function of temperature, time, and 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 thermo gravimetric analysis (TGA). The block copolymer greatly improved the compatibility of the blend between nylon and PMMA. At the same time, the redox system made up of Cu(Ⅲ) and PEG was employed to initiate the block copolymerization of acrylate monomers onto PEG backbone. Effects of different factors on the blocking parameters were examined. The structure of the block copolymers was confirmed by Fourier transfrorm infrared spectroscopy (IR), scanning electron microscope (SEM), and thermogravimetric analysis (TGA).Finally, Cu(Ⅲ) - ActⅣe Carbon black, Cu(Ⅲ)- Carbon black and Cu(Ⅲ)- phenolic resin redox intiation systems were employed to initiate the graft copolymerization of acrylate monomers. The grafting parameters have been determined as different conditions And then, the graft copolymers improved some characters than the backbone.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > Polymerization,polycondensation reaction
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