Crystallization of polyethylene oxide III

✍ Scribed by Afifi-Effat, Amr M. ;Hay, James N.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1977
• Tongue: English
• Weight: 382 KB
• Volume: 9
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980090407

✦ Synopsis

Abstract

The crystallisation kinetics of high molecular weight fractions of polyethylene oxide have been measured dilatometrically and also with a polarising light microscope. In general, marked deviations from the Avrami equation with exponent of 3.0 are observed which cannot alone be accounted for either in terms of rejection of low molecular weight molecules or secondary crystallisation by which crystal perfection occurs. Anomalies in nucleation, and the presence of induction periods, are present, which can account for the apparent low values of the Avrami exponent, i.e. 2.0.