Synthesis and characterization of copolymer and terpolymer with maleic anhydride and n-isopropyl acrylamide, homopolymer of poli(4-vinylpyridine), and investigation of properties

In this study, Poly 4-vinylpyridine (P4VP), Poly(4- vinylpyridine -co-maleic anhydride) [Poly(4VP-co-MA)], and Poly(4- vinylpyridine -co- maleic anhydride-co-N-isopropyl acrylamide) [Poly(4VP-co-MA-co-NIPA)] were synthesized by free radical-initiated polymerization in anhydrous medium in nitrogen atmosphere. Toluene, 1,4-dioxane and methanol as solvent; AIBN and Bz2O2 as initiated were used at polymer synthesis. P4VP was synthesized at 60 0C and 80 0C , poly(4VP-co-MA) and poly(4VP-co-MA-co-NIPA) were synthesized at 65 oC and 80 0C. Solutions of polymer were prepared in different solvents and solubilities were determined. Polymer structures were characterized by UV-visible, FTIR, 1H NMR and 13 C NMR spectra. Monomer percents were determined from elemental analysis of Poly(4VP-co-MA). Monomer percent was obtained m1= 37,84 (4VP) and m2= 62,16 (MA) from elemental analysis. Thermal properties of polymers were investigated by TGA, DTA and DMA. Surface analyses of polymers were clarified by SEM. The crystal structure of polymers were investigated by XRD and crystal ratio were calculated. UV-visible, FTIR, 1H NMR and 13 C NMR spectra; the result of elemental analysis, SEM and XRD; termal analyses were proved that it was polymer.