Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 9: SYMPOSIUM: Polymer networks and beyond: From molecular structure to materials and biological functions POSTER

CPP 9.8: Poster

Saturday, March 5, 2005, 16:45–18:45, Poster TU D

High frequency interfacial rheology on rubbery materials in adhesive contact — •Miriam Kunze, Binyang Du, and Diethelm Johannsmann — Institute of Physical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 4, 38678 Clausthal-Zellerfeld

Mechanical and rheological properties of adhesives are of prime importance for their adhesive strength, their debonding behavior, and their durability. For instance, the critical energy release rate of a pressure sensitive adhesive strongly depends on stress relaxation processes near the crack tip. We report on the combination of a classic instrument of adhesion science - the JKR apparatus - with the quartz crystal microbalance (QCM). Frequency shift and bandwidth of the resonator provide rheological spectra of the material in close proximity (ca. 100 nm) to the substrate. Advantages and limitations of the technique are discussed. Measurements were performed with Kraton G and a PDMS gel. In a few cases, we do find interfacial shear-softening. In most cases, however, the near-surface properties appear to be independent of stress.