|
Authors
|
Schlegel, R. ; Wilkin, D. ; Duan, Y. ; Weidisch, R. ; Heinrich, G. ; Uhrig, D. ; Mays, J.W. ; Iatrou, H. ; Hadjichristidis, N.
|
|
Title
|
Stress softening of multigraft copolymers
|
|
Date
|
17.12.2009
|
|
Number
|
21983
|
|
Abstract
|
The hysteresis behaviour of multigraft (MG) copolymers, with a polyisoprene backbone and polystyrene (PS) side chains, was investigated by applying a modified softening model proposed by Elías-Zúñiga, which uses an approach of Ogden and Roxburgh. The model was combined with the non-affine tube model of rubber elasticity of Kaliske and Heinrich. Four parameters are obtained: chemical and physical cross-link moduli (Gc, Ge), the number of statistical segments between two successive entanglements (ne/Te) and a softening parameter (b). The model was proven to be valid by a comparison with other methods evaluating hysteresis behaviour. The characterization of the multigraft copolymers revealed a branch point and molecular architecture dependence of the softening parameter. b was low for tetrafunctional MG copolymers with cylindrical microdomains, and it was further reduced for a spherical morphology and for more complex molecular architectures. The magnitude of b also depends on the PS arm molecular weight for hexa- and tetrafunctional multigraft copolymers.
|
|
Publisher
|
Polymer
|
|
Wikidata
|
|
|
Citation
|
Polymer 50 (2009) 6297-6304
|
|
DOI
|
https://doi.org/10.1016/j.polymer.2009.10.026
|
|
Tags
|
|
