Polymer conformation and NMR chemical shifts, 6. Alternating copolymer of α‐methylene‐γ‐butyrolactone with styrene

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<jats:title>Abstract</jats:title><jats:p>In view of the structural resemblance of α‐methylene‐γ‐butyrolactone to methyl methacrylate, conformation and NMR chemical shifts of poly(α‐methylene‐γ‐butyrolactone‐<jats:italic>alt</jats:italic>‐styrene). are calculated and compared with those of poly(methyl methacrylate‐<jats:italic>alt</jats:italic>‐styrene). The conformational energy surfaces for the dyad sequence models of the both copolymers are analogous to each other, as is expected from the similarity in the constituting monomeric units. Agreement of calculation with observation is satisfactory with respect to the cotacticity‐dependent splittings in the <jats:sup>13</jats:sup>C NMR spectra and is improved by the fixation of a substituent in poly(α‐methylene‐γ‐butyrolactone‐<jats:italic>alt</jats:italic>‐styrene). Calculation of <jats:sup>1</jats:sup>H chemical shifts gives an alignment of NMR signals which is in accordance with the observation.</jats:p>

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