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Isotactic-poly(1-butene) (iPB1) shows superior mechanical properties after crystal–crystal transitions. Recently, Miyoshi et al. found that crystalline stems in metastable tetragonal crystal perform uniaxial rotational diffusions accompanying side-chain conformational transitions in the fast motional limit (correlation time, τc <10−7 s; Macromolecules 2010, 43, 3986–3989.). In this study, molecular dynamics in stable trigonal crystal is investigated by solid-state nuclear magnetic resonance, which indicates that crystalline stems and side-chain conformations are completely fixed up to melting points (τc >10 s). In addition, lamellar thickness, l of iPB1 and a low isotacticity iPB1 (low_iPB1) with mmmm=78%, respectively, were investigated by small-angle X-ray scattering. The low_iPB1 sample shows very week supercooling dependence of l (~5 nm), whereas iPB1 shows strong supercooling dependence of l (10–28 nm). On the basis of molecular dynamics and l results, molecular dynamics effects on structures and unique mechanical property of iPB1 are discussed.

Critical roles of molecular dynamics in the superior mechanical properties of isotactic-poly(1-butene) elucidated by solid-state NMR