Determination of residual unsaturation in highly crosslinked, dough‐moulded poly(methyl methacrylate) dental polymers by solid‐state13C NMR

摘要

AbstractMethyl methacrylate has been copolymerized with eight multifunctional, cross‐linking comonomers in mixtures containing poly(methyl methacrylate) to give highly crosslinked polymers for trial as dental resins. These insoluble, optically opaque polymers have been characterized by solid‐state13C Nuclear Magnetic Resonance spectroscopy. The crosslinking comonomer could be identified from the appropriate resonances in the solid‐state spectra. Unreacted methacrylate groups could be determined quantitatively from the resonance at 167 ppm due to CO adjacent to CC at concentrations down to at least 0.5 of the total CO. The final conversion of CC double bonds in the comonomer depended on the nature and length of the spacer segment between the reactive methac