Year: 2009
Type: article
Abstract: Raman spectroscopy is used to investigate the alpha- and beta-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 beta-spherulite among alpha-spherulites with a well-defined resolution. Anisotropy of the crystalline phase orientation within a beta-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 beta-spherulite.
Source: Applied Spectroscopy
Authors: J. Martin, P. Bourson, A. Dahoun, J. M. Hiver
Language: English
Subfield: Polymers and Plastics
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2083673359