✦ LIBER ✦

Isothermal melt crystallization and melting behaviour of syndiotactic polypropylene

✍ Scribed by Pitt Supaphol; Joseph E Spruiell; Jar-Shyong Lin

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 199 KB
Volume: 49
Category: Article
ISSN: 0959-8103
DOI: 10.1002/1097-0126(200011)49:11<1473::aid-pi533>3.0.co;2-9

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✦ Synopsis

The lamellar morphological information and subsequent melting behaviour of syndiotactic polypropylene (s-PP) samples isothermally crystallized at crystallization temperatures ranging from 30 to 95 °C have been investigated using a combination of wide-angle X-ray diffraction (WAXD), smallangle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) techniques. Three known methods for determining the equilibrium melting temperature T m °, namely the Gibbs±Thomson extrapolation, the linear Hoffman±Weeks extrapolation and the non-linear Hoffman±Weeks extrapolation, have been employed to evaluate this important thermodynamic parameter, and the results obtained are compared. Finally, an estimate of the equilibrium melting temperature for a perfect s-PP sample (T m °)100% is given.

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