In order to verify how stress induces crystalline structure change upon drawing, chain packing structures of a form of isotactic polypropylene are investigated via 13C high resolution NMR. It is found that ordered packing fractions monotonically decrease with increasing draw ratio, depending on initial structures and drawing temperatures. Mechanisms of the unique transformation are discussed on the basis of crystallographic constraints. Moreover, molecular dynamics of crystalline region is characterized by 1D exchange NMR. Relationship between molecular dynamics and structures is built.

New insights into molecular deformation of isotactic-polypropylene upon uniaxial stretching by solid-state NMR

245th National Meeting (2013)

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