Contents

	Biographical Information Current Projects Publications and Conferences Personal Information Cool Links

Biographical Information

Education

Massachusetts Institute of Technology, Department of Chemical Engineering

• Sept 1988-June 1993
• Ph.D. in Chemical Engineering
• Thesis Advisors: Robert E. Cohen (ChE), Ali S. Argon (ME)
• Thesis Title: Probing the Limits of Toughening by Diluent-Induced Localized Plasticization in Polymer Blends

University of Wisconsin, Department of Chemical Engineering

• Sept 1984 - May 1988
• B.S. in Chemical Engineering (May 1998)
• Graduated Highest Honors (GPA 3.9)
• AIChE president

Work Experience

Cambridge Polymer Group (1996 - present)

• Founder. CPG provides services in consulting, instrumentation, research, and development in the area of polymeric materials. Testing services include DSC, FTIR, TEM, SEM, AFM, and shear and extensional rheometry.

Harvard University (1993 - present)

• Research Associate in the Division of Engineering and Applied Sciences
• Examining the extensional behavior of polymeric fluids through birefringence, imaging, and force measurements. Leading team of NASA engineers to design, fabricate, and test rheometer to be launched on the space shuttle. The device will be the first to measure purely extensional properties of polymeric fluids. Experience includes fluid preparation and rheological characterization, equipment design, integration and testing, writing of control and analysis code in LabVIEW and Visual Basic, and experimental verification of system.

Massachusetts Institute of Technology (1988-1993)

• Research assistant in Chemical Engineering.
• Experimentally verified existing theory of toughening by localized plasticization through tensile testing, electron microscopy, and craze velocity measurements. Examined effects of radiation on material properties. Constructed apparatus for measuring craze growth. Responsible for Instron, optical and transmission electron microscope maintenance.

Kimberly-Clark, Neenah, WI (1987)

• Summer intern in adhesives laboratory.
• Synthesized and characterized novel pressure-sensitive adhesive through thermal, optical, and mechanical testing.

University of Wisconsin-Madison (1985-1988)

• Undergraduate research assistant in block copolymer laboratory.
• Performed contact angle measurements, Fourier transform infrared spectroscopy, and differential scanning calorimetry experiments.

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Current Projects

The Extensional Rheology of Non-Newtonian Fluids We are conducting experimental measurements of the extensional viscosity of viscous non-Newtonian solutions. A novel filament stretching rheometer was constructed that imposes a true uniaxial flow on small samples of fluid. The transient stress growth coefficient, or the extensional viscosity can be monitored as a function of strain rate and strain up to final Hencky strains of 5. The relaxation behavior of the extended polymer chains can be measured following extensional deformation. For more information about extensional rheology, go to the Extensional Rheology Experiment web site.

Birefringence of Extensional Flows Phase-modulated birefringence is used to non-invasively probe the transient conformation of polymer chains in a dilute solution when this material is exposed to an extensional flow. The transient chain extension and relaxation is accessible for these purely uniaxial 2 dimensional flows. This work is the first of its kind for a filament stretching rheometer.

This work is funded under NASA Grant# NAG3-1385 .

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Publications and Conferences

Publications

• Spiegelberg, S.H. and McKinley, G.H., "Stress Relaxation and Elastic Breakup of Viscous Polymer Solutions in Extensional Studies," to appear J. Non-Newtonian Fluid Mech., (1996).
• Abstract
• Download a postscript version of the paper (?? Kb)
• Spiegelberg, S.H., Ables, D.C., and McKinley, G.H., "The Role of End-Effects on Measurements of Extensional Viscosity in Filament Stretching Rheometers," J. Non-Newtonian Fluid Mech., 64 , 229-257 (1996).
• Abstract
• Download a postscript version of the paper (?? Kb)
• Spiegelberg, S.H., and Cohen, R.E., "Toughening of Glassy Polymers Via Dilatational Plasticity," The Polymeric Materials Encyclopedia: Synthesis, Properties, and Applications, Salamone, J.C., ed., CRC Press, Inc. (1996).
• Spiegelberg, S.H., Argon, A.S., and Cohen, R.E., "Effects of Radiation on Polybutadiene/Polystyrene Blends, " J. Appl. Polym. Sci., 58, 85 (1995).
• Abstract
• Spiegelberg, S.H., Argon, A.S., and Cohen, R.E., "Kinetics of Crazing in Polybutadiene/Polystyrene Blends," J. Appl. Polym. Sci., 53, 1251 (1994).
• Abstract
• Spiegelberg, S.H., Argon, A.S., and Cohen, R.E., "Measurements of Craze Velocities in Polystyrene/Polybutadiene Blends," J. Appl. Polym. Sci., 48, 85 (1993).
• Abstract
• Pitt, W.G., Spiegelberg, S.H., and Cooper, S.L., "Adsorption of Fibronectin to Polyurethane Surfaces: Fourier Transform Infrared Spectroscopic Studies," ACS Symposium Series No. 343, Proteins at Interfaces: Physiochemical and Biochemical Studies, 324 (1987).
• Abstract

Conferences

• Spiegelberg, S.H., and McKinley, G.H., "Extensional Viscosity and Birefringence Measurements of Viscous Polymer Solutions in Filament Stretching Flows," AIChE '96, Chicago, IL (1996). Click here to view the slides
• Spiegelberg, S.H., McKinley, G.H., "Elastic and Viscous Contributions to Stress in Extensional Rheometry of Viscous Polymer Solutions," XIth Int. Cong. on Rheol., Quebec City, Quebec (1996).
• Spiegelberg, S.H., and McKinley, G.H., "The Extensional Rheology of Non-Newtonian Materials," Third Microgravity Fluid Physics Conference, NASA-LeRC, Cleveland, OH (1996).
• Spiegelberg, S.H., McKinley, G.H., "Experimental Observations in Extensional Flows of Viscous Polymer Solutions, " Unresolved Experimental Dilemmas, Isaac Newton Institue of Mathematical Studies, UK (1996).
• Spiegelberg, S.H., and McKinley, G.H., "Extensional Rheology of Polymer Solutions: Polystyrene Boger Fluids," AIChE '95, Miami, FL, (1995).
• Pakdel, P., Spiegelberg, S.H., and McKinley, G.H., "Cavity Flow of Viscoelastic Fluids," AIChE '95, Miami, FL, (1995).
• Spiegelberg, S.H., Ables, D.C., and McKinley, G.H., "Extensional Behavior of Polymer Solutions," Society of Rheology 67th Annual Meeting, Sacramento, CA (1995).
• Spiegelberg, S.H., and McKinley, G.H., "Generation and Deformation of Newtonian and Non-Newtonian Liquid Bridges," AIChE '94, San Fransisco, CA, (1994).
• Spiegelberg, S.H., Gaudet, S., and McKinley, G.H., "The Extensional Rheology of Non-Newtonian Materials," Second Microgravity Fluid Physics Conference, NASA-LeRC, Cleveland, OH (1994).
• Spiegelberg, S.H., Argon, A.S., and Cohen, R.E., "Limits of Toughening by Localized Plasticization, " ANTEC '93, New Orleans, LA (1993).
• Spiegelberg, S.H., Argon, A.S., and Cohen, R.E., "Measurements of Craze Velocities in Polystyrene/ Polybutadiene Blends," MRS Symposium, San Francisco, CA (1992).
• Spiegelberg, S.H., Argon, A.S., and Cohen, R.E., "Measurements of Craze Velocities in Glassy Polystyrene in the Presence of Low Molecular Weight Polybutadiene Diluents," ACS Fall Meeting, Washington, DC, (1990).

Short Courses

• Spiegelberg, S.H., and McKinley, G.H., "Rheology and the non-Newtonian Fluid Dynamics in the Processing of Polymeric Materials," presented at the Nasa Lewis Research Center, Cleveland, June (1995).

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Personal Information

I play in a brass quintet named Valve Job. We perform a mix of Classical, contemporary, show tunes, Baroque, and of course several AC/DC covers tunes.

The mountain biking in New England is a mix of mud, rocks, roots, mosquitoes, and hills (i.e. fun). Check out the New England Mountain Biking Association (NEMBA) web site for more information about biking here. I recently went on a biking trip to Moab, Utah. Click here to see some cool pictures from the trip.

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Cool Links

• Cambridge Polymer Group. Provides consultation in the rheology and morphology of polymers
• Bicycle ShopView A good place to find the cheapest mail order bike parts.
• Theater Mirror. What's playing in community theater in Boston?

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Send comments to: steve@campoly.com

Last revised: September 6, 1999

Copyright © 1999 Stephen Spiegelberg. All rights reserved.