1. IU CINQUIMA, University of Valladolid, Paseo Belén 5, E-47011 Valladolid, Spain
2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 México City, Mexico
3. Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain
4. SMAP, UA-UVA_CSIC, Associated Research Unit to CSIC, School of Sciences, University of Valladolid, Paseo Belén 7, E-47011 Valladolid, Spain
5. McKetta Department of Chemical Engineering, Texas Materials Institute, The University of Texas at Austin, 200 E Dean Keeton Street, Austin, 78712-1589 Texas, United States