Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

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.