1. Department of Polymer Engineering and Color Technology; Amirkabir University of Technology; Tehran P.O. Box 15875-4413 Iran
2. Department of Polymer Engineering; Sahand University of Technology; Tabriz P.O. Box 51335-1996 Iran
3. Institute of Polymeric Materials; Sahand University of Technology; Tabriz P.O. Box 51335-1996 Iran