Effect of crosslinking on the secondary relaxation in polyvinylethylene

✍ Scribed by R. Casalini; C. M. Roland

• Book ID: 105339328
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 514 KB
• Volume: 48
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/polb.21925

✦ Synopsis

Abstract

The effect of network formation on the secondary (Johari–Goldstein) β‐relaxation was investigated for polyvinylethylene (PVE). Crosslinking affects the segmental (α‐) process in the usual fashion, the networks exhibiting slower and more temperature‐sensitive dynamics. However, the effect on the β‐process is the opposite. The secondary relaxation becomes faster and the activation energy slightly decreases with crosslinking. The strength of the intermolecular cooperativity governing the behavior of the α‐process was assessed using the coupling model, with consistent results obtained from analysis of both the timescale separating the α‐ and β‐relaxations and the activation energy for the latter. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 582–587, 2010