Abstract
AbstractDynamic structure and polymer‐solvent interactions in solutions and gels of isotactic (i) poly(methyl methacrylate) (PMMA) in butyl acetate (BAC) were characterized by measurements of nonselective and selective 1H NMR spin‐lattice relaxation times of the solvent. In thermoreversible gels, the existence of i‐PMMA‐BAC complex, where the life‐time of the bound solvent is − 100 ms or shorter, was confirmed. Although the correlation time of the solvent bound in i‐PMMA‐BAC complex is 5‐10 times longer than for the free solvent, there is still a relative motional freedom for complexed solvent molecules. The same behaviour observed recently for thermoreversible gels of syndiotactic PMMA indicates the same character of polymer‐solvent complexes in gels of both stereoregular forms of PMMA.
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