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Investigation of the crystallization process of syndiotactic polypropylene quenched at 0°C from the melt or concentrated solutions by solid-state 13C NMR spectroscopy by T. Nakaoki; Y. Ohira; F. Horii is a Materials Science article available to read on EtoBox.
What is Investigation of the crystallization process of syndiotactic polypropylene quenched at 0°C from the melt or concentrated solutions by solid-state 13C NMR spectroscopy about?
The crystallization process of syndiotactic polypropylene (sPP) quenched from the melt or concentrated solutions has been investigated by high-resolution solid-state 13 C NMR spectroscopy in order to make clear the formation of the planar zigzag form at 08C. The sPP ®lm just after quenching at 08C from the melt is in the noncrystalline state, but when the ®lm is left at room temperature, crystals with sPP in the t 2 g 2 conformation are quickly produced. The 13 C NMR spectral shape of the CH 2 resonance line is similar to that of the sPP gels previously obtained. For the gels quenched at 08C from concentrated solutions, T 1C and T 2C measurements reveal that segmental mobility remarkably decreases with increasing polymer concentration in the noncrystalline phase, whereas it stays unchanged in the crystalline phase as a result of lack of penetration of solvent molecules. Increase of viscosity in the noncrystalline phase results in the decrease of molecular mobility. In particular, molecular mobility is extremely restricted in the noncrystalline phase for the solvent-free sample, compared with the case of the gels. A line shape analysis of the CH 3 resonance line indicates that the t
Who reads Investigation of the crystallization process of syndiotactic polypropylene quenched at 0°C from the melt or concentrated solutions by solid-state 13C NMR spectroscopy?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- T. Nakaoki; Y. Ohira; F. Horii
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)
- Published
- 2001
- Language
- EN
- Field
- Materials Science (Physical Sciences)