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Block Copolymerization Of Poly(Diethylene Glycol Phthalic Anhydride) And Acrylate Initiated By Potassium Diperiodatocuprate(III)

Libin BAI, Yinghai LIU,Yuanwei LIU, Kuilin DENG

Block copolymers of methyl acrylate(MA), methyl methacrylate(MMA) and poly(diethylene glycol phthalic anhydride)(PPAG)were synthesized using a novel redox system-potassium diperiodatocuprate(III)[DPC]/PPAG system in alkaline medium. Block copolymers with high total conversion were obtained, which indicated that DPC/PPAG redox system was an efficient initiator for this blocking. The total conversion at different conditions (concentration of reactants, temperature, concentration of the DPC, reaction time) was investigated. The overall activation energy of this blocking is 44.57 kJ/mol. The 1HNMR analysis and infrared spectra proved that the block copolymers were synthesized successfully. A mechanism is proposed to explain the generation of radicals and the initiation of block copolymerization. The block copolymer was used as the compatibilizer in blends of PMMA and nylon6. The SEM photographs show that the block copolymer greatly improved the compatibility of the blend.