1. Department of Civil and Environmental Engineering; University of Perugia; Strada di Pentima 4 05100 Terni Italy
2. Local Research Unit; INSTM Consortium for Materials Science and Technology; Via Giusti 9 50121 Firenze Italy
3. Instituto de Ciencia y Tecnologia de Polimeros; CSIC; Juan de la Cierva, 3 28006 Madrid Spain