Stress softening of multigraft copolymers

R. Schlegel, D. Wilkin, Y. Duan, R. Weidisch*, G. Heinrich, D. Uhrig, J. W. Mays, H. Iatrou, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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 (G c , G e ), the number of statistical segments between two successive entanglements (n e /T e ) 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.

Original languageEnglish (US)
Pages (from-to)6297-6304
Number of pages8
JournalPolymer
Volume50
Issue number26
DOIs
StatePublished - Dec 10 2009

Keywords

  • Molecular architecture
  • Multigraft copolymers
  • Stress softening

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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