A Two-Day Short Course On
Extensional Rheology of Polymer Melts and Solutions
[70th Annual Meeting Home Page]
Saturday and Sunday
in conjunction with the
Donald G. Baird
Gareth H. McKinley
David F. James
Donald G. Baird is the Harry C. Wyatt Professor of Chemical Engineering at Virginia Tech whose primary interest is in the application of rheology to the processing of polymer melts.He is the co-author of a recent book entitled "Polymer Processing: Principles and Design".
Gareth H. McKinley is the Lord Associate Professor of Mechanical Engineering at the Massachusetts Institute of Technology. His primary research interests focus on the extensional rheology of polymer solutions and the stability of viscoelastic flows.
David F. James is Professor of Mechanical Engineering at the University of Toronto and is internationally recognized for his work in the extensional flow of polymer solutions.
The processing of polymer melts and solutions involves both shear and extensional (i.e. shearfree) deformations. While transport processes are generally dominated by shear, it is the extensional component which often governs the processing performance of a fluid. A fluids extensional behavior is most likely related to many processing and flow problems such as melt fracture which originates in the die entry, draw resonance in fiber spinning and film casting, fluctuations in the frost-line and bubble diameter in film blowing, and variations in film thickness in coating processes, tack problems in printing, and droplet size distribution in spraying. However, in most laboratories the material functions most commonly measured are the shear properties and in industrial laboratories or quality-control applications the primary emphasis is on the shear viscosity and linear viscoelastic properties of a material. Yet, there are a number of documented instances in which two fluids have similar viscous behavior and apparent molecular weights, but do not process in the same way. Large differences in the material characteristics are only manifested in the tensile stress growth observed during elongational flow.
In this course, we begin by describing the differences between extensional and shear kinematics. We then turn our attention to the wide variety of experimental techniques for measuring the extensional properties of polymer solutions and then polymer melts. Both rigorous and approximate techniques are discussed. Throughout the course examples of applications of the measurements are provided. A portion of the course will be devoted to a discussion of constitutive equations appropriate for handling the various classes of extensional rheological response observed for melts and solutions and their importance in computational modeling of polymer processing operations.
The course is designed to be suitable for a wide range of professionals including engineers, chemists, and physicists, as well as students in these disciplines. Although the emphasis will be on experimental techniques and applications of the measurements, discussion of constitutive equations which are suitable for both shear and extension will be included.
The fee for the two-day course is $375 prior to September 15, 1998. For registration after September 15, the fee will be $425. Student rates are half of the above.
Checks should be made payable to The Society of Rheology and sent together with the short course registration form to:
Reservations for lodging should be made by the participant. A block of rooms is being held for the short course at the Stanford Terrace Inn (telephone: 650-857-0333; hotel registration form is available at this website) in Palo Alto, walking distance to the classroom. Transportation from Stanford to the SOR meeting in Monterey will be provided for participants.
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