Mechanical properties, molecular motions and density fluctuations in polymer-additive mixtures

✍ Scribed by Fischer, E. W. ;Hellmann, G. P. ;Spiess, H. W. ;Hörth, F. J. ;Ecarius, U. ;Wehrle, M.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1985
• Weight: 925 KB
• Volume: 12
• Category: Article
• ISSN: 0025-116X
• DOI: 10.1002/macp.1985.020121985117

✦ Synopsis

Two effects are of outstanding importance for the mechanical behaviour of polymer-additive mixtures, (a) the plasticizer effect and (b) an effect, which we shall refer to as the "D-suppression"effect: Additives can suppress the secondary (0-) relaxations of the polymer. The O-suppression effect is studied on a number of polymers and additives {dynamic mechanical and dielect r i c measurements), the molecular motions involved are characterized ( H-NMR spectroscopy) and the thermal density fluctuations are measured (SAXS experiments). A model t o explain the effect in terms of the free volume fluctuations i s presented.