1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
2. Consiglio Nazionale delle Ricerche (Instituto Officina dei Materiali) and INSIDE@ILL c/o Institut Laue-Langevin, 38042 Grenoble, France
3. Institut Laue-Langevin, 38042 Grenoble, France
4. Université Paris-Saclay, Laboratoire Léon-Brillouin, UMR12 CEA-CNRS, CEA-Saclay, F-91191 Gif-sur-Yvette CEDEX, France