The authors wish to thank Marty Sheridan, Jennifer Forgue and Courtland Handy of The R. T. Vanderbilt Company, Inc. as well as Mark Jones and Andy Anderson of Zeon Chemicals, L. P., for their insights, technical support and their valuable contributions to this paper.  The authors are also greatly indebted to Dr. Terry Myers of Arkema Inc. for his invaluable technical support, and to our colleague, Arnaud Prebe for his contribution to this paper while working at our King of Prussia R&D Center.