Transport properties of poly(ethylene terephthalate) crystallized from the glassy state

✍ Scribed by L. Bove; C. D'Aniello; G. Gorrasi; L. Guadagno; V. Vittoria

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 458 KB
• Volume: 7
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199611)7:11<858::aid-pat594>3.0.co;2-o

✦ Synopsis

Poly(ethy1ene terephthalate) was crystallized from the glassy state at 120 and 200°C. The structural organization of samples, after the primary and secondary crystallizations, was analyzed by density, X-rays, infrared and transport properties of dichloromethane vapor. The values of crystallinity derived with different methods do not agree, indicating that the crystallized samples cannot be considered simply biphasic. Since the fraction of the impermeable phase is much higher than the fraction of the crystalline phase, it suggested that the presence of mesomorphic form, impermeable to the vapors at low activity. With this hypothesis, the complete composition of the crystalline samples, in terms of fraction of crystalline, amorphous and mesomorphic form was derived. A value of density of the mesomorphic form of 1.39 gfcm3 was also derived.