Synthesis of imide-based methacrylic monomers and their copolymerization with methyl methacrylate: monomer reactivity ratios and heat resistance properties

摘要

The newly designed methacrylic monomer series 4-phthalimidocyclohexyl methacrylate (PCMA), 4-hexahydrophthalimidocyclohexyl methacrylate (HPCMA) and 4-hexahydro-3,6-methanophthalimidocyclohexyl methacrylate (HMPCMA) were synthesized. Their homopolymers and methyl methacrylate (MMA) based copolymer series were polymerized by free-radical polymerization. The copolymer compositions were characterized using H-1 NMR spectra. The monomer reactivity ratios were calculated employing the Fineman-Ross (F-T) and Kelen-Tudos (K-T) methods at low conversion. The values of r(1) and r(2) obtained by the F-T and K-T methods appear to be in close agreement (their average values are r(1)=1.3061 and r(2)=0.7336 for poly(PCMA-co-MMA), r(1)=1.5169 and r(2)=0.6840 for poly(HPCMA-co-MMA), r(1)=1.7748 and r(2)=0.5664 for poly(HMPCMA-co-MMA)) . The thermal stabilities and thermomechanical characteristics of the homopolymer and copolymer series were investigated by differential scanning calorimetry, thermogravimetric analysis and dynamic mechanical thermal analysis. (c) 2018 Society of Chemical Industry