1. Chemistry Department, Paulo Scarpa Polymer Laboratory (LaPPS), Federal University of Parana, P.O. Box 19032, Curitiba, Parana 81530-900, Brazil
2. Chemistry Institute, University of Campinas (Unicamp), P.O. Box 6154, Campinas, São Paulo 13084-971, Brazil
3. Institute of Science and Technology, Federal University of São Paulo, R. Talim, 330, São José dos Campos, São Paulo 12231-280, Brazil