1. REQUIMTE/CQFB, Departamento de Química, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; 3B's Research Group-Biomaterials, Biodegradables, Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar 4710-053 Braga, Portugal; and Department of Polymer Engineering, University of Minho, Campus de Azurém 4800-058 Guimarães, Portugal