The 13C spin‐lattice relaxation times, T1s, of both stereoregular poly(methyl methacrylates) (PMMA) and homologous series of n‐alkyl acetate solvents in solution have been measured at 40°C. It was observed that the motion of polar side‐chains was highly affected by the degree of interaction with solvent molecules. The stronger polymer‐solvent interactions in predominantly syndiotactic PMMA solutions than in isotactic PMMA solutions were shown from the T1 values for the carbonyl, methoxy, and quaterna…
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