1. Polymer
Physics, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
2. Laboratory
of Polymer Chemistry, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10,
HCI J 541, CH-8093 Zurich, Switzerland
3. Université Grenoble 1/CNRS, LIPhy UMR 5588, 38041 Grenoble, France