Leipzig 1999 – wissenschaftliches Programm
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PO: Polymerphysik
PO 15: Blockcopolymere und Elastomere II
PO 15.2: Vortrag
Mittwoch, 3. März 1999, 11:00–11:20, HS 19
Dynamical Signatures of the Vulcanization Transition — •Annette Zippelius1, Kurt Broderix1, and Paul M. Goldbart2 — 1Institut für Theor. Physik, Universität Göttingen, D-37073 Göttingen — 2Dept. of Physics, Univ. of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Il. 61801
Dynamical properties of vulcanized polymer networks are addressed via a Rouse type model that incorporates the effect of permanent random cross-links. The incoherent intermediate scattering function is computed in the sol and gel phases, and at the vulcanization transition between them. At any nonzero cross-link density within the sol phase Kohlrausch relaxation is found. The critical point is signaled by a divergence of the longest time scale, and at this point the scattering function decays algebraically, wheras within the gel phase it acquires a time- persistent part identified with the gel fraction.