1. Department of Polymer Engineering, Faculty of Engineering, South Tehran BranchIslamic Azad University P.O. Box 19585‐466 Tehran Iran
2. Department of Polymer ProcessingIran Polymer and Petrochemical Institute P.O. Box 14965‐115 Tehran Iran
3. Leibniz Institute of Polymer Research Dresden HoheStraße 6 Dresden D‐01069 Germany
4. Caspian Faculty of Engineering, College of EngineeringUniversity of Tehran P.O. Box 43841‐119 Guilan Iran
5. School of Chemical Engineering, College of EngineeringUniversity of Tehran P.O. Box 11155‐4563 Tehran Iran