1. Department of Physical-Chemistry, Institute of Chemistry, University of Campinas − UNICAMP P.O. Box 6154, 13084-862 Campinas, SP, Brazil
2. UPMC Univ Paris 06, UMR 7610, Chimie des Polymères, F-75005 Paris, France, and CNRS, UMR 7610, Chimie des Polymères, F-75005 Paris, France