Berlin 2001 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 5: Composites
CPP 5.1: Vortrag
Dienstag, 3. April 2001, 17:45–18:05, 111
Adhesion and fracture at polymer interfaces — •C. Lorenz-Haas1, P. Müller-Buschbaum2, C. Creton3, and M. Stamm4 — 1MPI für Polymerforschung, Ackermannweg 10, 55128 Mainz — 2TU München Physik Department LS E13, James-Franck-Str.1, 85747 Garching — 3Laboratoire PCSM-ESPCI, 10 rue Vauquelin, 74231 Paris Cedex 05, France — 4IPF Dresden e.V., Hohe Str. 6, 01069 Dresden
Welding is a common technique in link formation between plastic parts. Via interdiffusion of the polymer chains an interface of a certain width is developing dependent on annealing time [1]. In previous experiments a correlation between interface width and fracture toughness measured by the Double Cantilever Beam method (DCB) was found [2]. With this method energy is not only placed in the propagation of the crack along the interface but also in the formation of a plastic zone around the crack tip. To get an insight in the various failure mechanisms of the interface we additionally investigated structure formation in this zone by means of Scanning-USAX and Scanning-Microfocus-SAXS. The observed scattering pattern show a strong dependency on the position in the plastic zone. Further analysis is leading to different slopes in the log-log presentation of the data. This can be interpreted by scattering from certain defect structures [3].
[1] K. Kunz, M. Stamm, Macromolecules 29, 2548 (1996)
[2] R. Schnell, M. Stamm, C. Creton, Macromolecules 32, 3420 (1999)
[3] G. J. Salomons, M. A. Singh, T. Bardouille, W. A. Foran, M. S. Capel, J. Appl. Cryst. 32, 71 (1999)