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Determination of residual unsaturation in highly crosslinked, dough‐moulded poly(methyl methacrylate) dental polymers by solid‐state 13 C NMR
Author(s) -
Earnshaw Richard G.,
Price Carole A.,
O'Donnell James H.,
Whittaker Andrew K.
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070320608
Subject(s) - comonomer , methacrylate , methyl methacrylate , polymer , polymer chemistry , materials science , poly(methyl methacrylate) , degree of unsaturation , nuclear magnetic resonance spectroscopy , solid state nuclear magnetic resonance , chemistry , polymerization , organic chemistry , nuclear magnetic resonance , composite material , physics
Abstract Methyl 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‐state 13 C 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 CO adjacent to CC at concentrations down to at least 0.5% of the total CO. The final conversion of CC double bonds in the comonomer depended on the nature and length of the spacer segment between the reactive methacrylate groups.