1. Polymer Char, València Parc Tecnologic, P.O. Box 176, E‐46980 Paterna, Spain
2. Dow Chemical Europe, Analytical Laboratory, P.O. Box 195, E‐43080 Tarragona, Spain
3. Dow Chemical , Polyolefins Research, B‐1740, 2301 N. Brazosport Blvd. Freeport, Texas 77541