Abstract
Spin-lattice relaxation times T 1 of 13C and 1H nuclei, as well as nuclear Overhauser enhancement ( NOE) values of stereoregular poly(methyl methacrylates) (PMMA) in CD 3CN and CDCl 3 were measured. Analysis of these data has shown that the mobility of PMMA in solution is affected by stereoregularity of PMMA and by solvent. Comparison of 13C and 1H n.m.r. relaxation data has further shown that the solvent affects also the local conformational structure of stereoregular PMMA in solution; this conclusion is supported by preliminary measurements of infra-red spectra. Based on this finding, the effect of solvent upon formation of the ordered structure of the so-called stereocomplex of PMMA is discussed.
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