1. F. Azadi, Prof. S. H. Jafari School of Chemical Engineering, College of Engineering University of Tehran Tehran 11155–4563 Iran
2. Department of Polymer Processing Iran Polymer and Petrochemical Institute Tehran 14965‐115 Iran
3. Leibniz Institute of Polymer Research Dresden Hohe Straße 6 Dresden D‐01069 Germany
4. School of Engineering University of British Columbia Kelowna BC V1V 1V7 Canada
5. Department of Polymer Engineering University of Bayreuth Bayreuth 95447 Germany