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Abstract
The quantitation of acrylate polymers by high-resolution 13C-NMR requires a knowledge of the spin-lattice relaxation times. For signals from non-protonated carbons, such as carbonyls, these relaxation times are frequently on the order of 1.5–2.0 s. Through the use of paramagnetic relaxation agents, it is possible to decrease the relaxation times. For poly(methyl methacrylate), poly(butyl methacrylate), and poly(hydroxyethyl methacrylate), it has been shown that Cr(acac)3 and Fe(acac)3 can be used to decrease the T1 of all 13C signals. Guidelines for the use of these relaxation agents in acrylics are given.