1. Departmento de Ingeniería
Química, Universidad de Huelva, Facultad de Ciencias Experimentales, Campus del Carmen, 21071 Huelva,
Spain
2. Department
of Chemical Engineering, Laboratory of Applied Rheology
and Polymer Processing, Katholieke Universiteit Leuven, Willem de Croylan 46, B − 3001 Heverlee, Belgium