Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 72: Polymer Networks and Elastomers
CPP 72.3: Vortrag
Mittwoch, 18. März 2020, 15:45–16:00, ZEU 114
An Analysis of the Gel Point of Polymer Model Networks by Computer Simulations — •Michael Lang and Toni Müller — Leibniz Institut für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden
The gel point of end-linked model networks is determined from computer simulation data. It is shown that the difference between the true gel point conversion, pc, and the ideal mean field prediction for the gel point, pc,id, is a function of the average number of cross-links per pervaded volume of a network strand, P, and thus, contains an explicit dependence on junction functionality f for stoichiometric model networks. On the contrary, the amount of intramolecular reactions at the gel point is independent of f in first approximation and exhibits a different power-law dependence on the overlap number of elastic strands as compared to pc−pc,id. Therefore, the delay of the gel point, pc−pc,id, cannot be predicted from intramolecular reactions and vice versa in contrast to a long standing proposal in the literature about polymer networks.