Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 3: Polymer Materials
CPP 3.5: Talk
Monday, March 27, 2006, 11:15–11:30, ZEU 114
Scattering from polymer networks under elongational strain — •Carsten Svaneborg1, Ralf Everaers1, and Gary S. Grest2 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden — 2Sandia National Laboratories, Albuquerque, NM 87185, USA
Molecular dynamics simulations are used to sample the single-chain form factor of labelled sub-chains in model polymer networks under elongational strain. We observe very similar results for randomly cross-linked and for randomly end-linked networks with the same average strand length and see no indication of lozenge-like scattering patterns reported for some experimental systems. Our data analysis shows that a recent variant of the tube model quantitatively describes scattering in the Guinier regime as well as the macroscopic elastic properties. The observed failure of the theory outside the Guinier regime is shown to be due to non-Gaussian pair-distance distributions. Nevertheless, the results presented here [1] and in Ref. [2,3] open up the possibility to systematically link SANS studies of microscopic deformations to the macroscopic elastic properties of rubber-elastic systems.
[1] C. Svaneborg, G. S. Grest, and R. Everaers. Euro. Phys. Lett. accepted.
[2] C. Svaneborg, G. S. Grest, and R. Everaers. Phys. Rev. Lett., 93:257801, 2004.
[3] C. Svaneborg, G. S. Grest, and R. Everaers. Polymer, 46:4283, 2005.