Graft Copolymerization of Methyl Acrylate onto Terpolyamide of Nylon 6/Nylon 66/Nylon 1010 Initiated by Potassium Diperiodatonickelate(IV)

The graft copolymerization of methyl acrylate onto nylon 6/nylon 66/nylon 1010 (terpolyamide) was studied in aqueous alkaline medium,with potassium diperiodatonickelate(Ⅳ)〔Ni(Ⅳ)〕-terpolyamide redox system as initiator.Graft copolymers with high grafting efficiency (～ 90%) were obtained,which indicated that Ni (Ⅳ)-terpolyamide system is an efficient redox initiator for this graft copolymerization.The dependence of grafting parameters on the concentrations of initiator and monomer,as well as temperature was investigated.Maximum grafting efficiency and percent grafting were obtained at c〔Ni(Ⅳ)〕=8×10~(-4) mol/L,c(MA)=1.5 mol/L,θ=35 ℃.FTIR,X-ray diffraction and SEM were employed to study the structure of the graft copolymers.A mechanism based on the two separate single-electron-transfer process of Ni (Ⅳ) to Ni (Ⅱ) was proposed to explain the formation of radicals and the initiation.In addition,the graft copolymer was employed as compatibilizer in blends of terpolyamide and poly(methyl methacrylate).The SEM photographs illustrated that the graft copolymer efficiently improved the miscibility of the blends.