C-13 Solid-State Nuclear-Magnetic-Resonance Spectra Of Some Air-Cured Alkyd Polyester Paints

High-resolution 13 C solid-state nuclear magnetic resonance spectra of air-cured linseed oil and a range of air-cured alkyd paint binders have been obtained using proton dipolar decoupling in conjunction with cross-polarization and fast magic angle spinning. 1 H spin-lattice relaxation times have been recorded in the solid state to optimize cross-polarization contact times. Most commonly encountered air-drying alkyd systems have been examined, including samples in the pigmented form. A range of modified alkyds has also been investigated by the technique. The results obtained in the solid state are compared to results previously obtained in the solution state and in the swollen state. Direct evidence of sample crosslinking has been obtained for the first time using nuclear magnetic resonance.