1. School of Chemical Engineering; University of Tehran; P. O. Box 11155-4563 Tehran Iran
2. Department of Resin and Additives; Institute for Color Science and Technology; P. O. Box: 16765-654 Tehran Iran
3. Iran Polymer and Petrochemical Institute; P. O. Box 14965/115 Tehran Iran
4. Leibniz Institute of Polymer Research Dresden; Hohe Str. 6 D-01069 Dresden Germany