F. Lequeux, D. Long, P. Sotta, K.SaalwäĘchter.
Constrained Dynamics in Interphases of Model Filled Elastomers: Role of Interface Chemistry on Crosslinking, Local Stress Distribution and Mechanics.
In: Angew. Chem. Int. Ed., 50, A63-A70 (2011). DOI 10.1002/anie.201105813.
In this contribution, we summarize first results and future perspectives of the DFG-ANR joint project "DINaFil" that is concerned with elucidating the synergistic effects of inorganic nanoparticle filler structures in cross-linked polymer networks. NMR investigations on a first model system based on poly(ethyl acrylate) have revealed quantitative relationships between the amount of immobilized polymer at the particle surface, i.e. an interphase, and the total internal surface, depending on temperature, the dispersion state and further on the specific surface modification of the particles. Notably, only systems with dense chemical surface grafts show an additional pronounced inhomogeneity of the surrounding rubber matrix. Current efforts are devoted to the extension of the model approach to polymers of actual application relevance, such as polyisoprene (natural rubber), further developing the NMR approaches to the study of stretched samples, the correlation of the NMR results with structural details and the thermo-mechanical properties of the systems, as well as the modelling of the results by computer simulations.