Einfluß einer orientierung der moleküle auf die kinetik der kristallisation von polyethylenterephthalat

✍ Scribed by Althen, Gaby ;Zachmann, Hans Gerhard

• Publisher: Wiley (John Wiley & Sons)
• Year: 1979
• Weight: 593 KB
• Volume: 180
• Category: Article
• ISSN: 0025-116X
• DOI: 10.1002/macp.1979.021801113

✦ Synopsis

Abstract

Amorphous samples of poly(ethylene terephthalate) were oriented by drawing at 92°C to different drawing ratios as well as by cold drawing. The kinetics of isothermal crystallization was determined in the range from 70°C to 115°C. The orientation of the samples was measured by the birefringence before crystallization. With increasing orientation also the rate of crystallization increases and the Avrami exponent n decreases from 3 to 1. The density obtained at the end of the crystallization process almost is not affected by the orientation. The results also indicate that some sort of order occurs already during the orientation process. The results are discussed. The birefringence does not change monotonically during crystallization.