title   
  

Long time stress relaxation of amorphous networks under uniaxial tension: The Dynamic Constrained Junction Model

Warning The system is temporarily closed to updates for reporting purpose.

Konyalı, Haluk and Menceloğlu, Yusuf Z. and Erman, Burak (2008) Long time stress relaxation of amorphous networks under uniaxial tension: The Dynamic Constrained Junction Model. Polymer , 49 (4). pp. 1056-1065. ISSN 0032-3861

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
247Kb
[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
903Kb

Official URL: http://dx.doi.org/10.1016/j.polymer.2008.01.011

Abstract

Poly-isoprene networks with different degrees of cross-linking and filler amount are studied under uniaxial stress relaxation. Time decay of stress obeys a stretched exponential form with a stretching parameter of 0.4 that is same for all independent variables, i.e., extensions, crosslink density and filler amount. Relaxation time τ increases with increasing strain, and decreases with both cross-link and filler content. Dependence of τ on filler content is less sensitive than on cross-link density. The isochronous Mooney-Rivlin plots show that the phenomenological constant 2C1 is time independent, and all time dependence results from that of 2C2 , which is associated with relaxation of intermolecular interactions at and above the length-scales of network chain dimensions. The relatively low value of the stretching parameter is interpreted in terms of a molecular model where entanglements contribute to relaxation at a wide spectrum of time scales.

Item Type:Article
Uncontrolled Keywords:Entanglements, junction fluctuations, viscoelasticity.
Subjects:T Technology > TP Chemical technology > TP1080 Polymers and polymer manufacture
ID Code:9629
Deposited By:Yusuf Z. Menceloğlu
Deposited On:30 Oct 2008 16:49
Last Modified:19 Jul 2019 12:53

Repository Staff Only: item control page