The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.
The -Spherulite Morphology of Isotactic Polypropylene Investigated by Raman Spectroscopy
Volume 63, Number 12 (Dec. 2009) Page 1377-1381
Martin, J.; Bourson, P.; Dahoun, A.; Hiver, J.M.
Raman spectroscopy is used to investigate the α- and β-crystalline polymorphs of isotactic polypropylene. Raman spectra of the polymorphs show some minor differences, in particular the wavenumber shifting of certain scattering bands, which reflect the environment of an isolated macromolecular chain within the packing unit cell of the different crystal forms. For example, the shifting of the 842 cm-1 scattering band, which is the most susceptible band to cause intermolecular interactions, is used to generate a structural map of one β-spherulite among α-spherulites with a well-defined resolution. Anisotropy of the crystalline phase orientation within a β-spherulite is also investigated by performing polarized Raman spectroscopy measurements. Differences in the polarized spectra are then finely exploited to map the radial lamellae orientation distribution within one β-spherulite.