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Bernhard Wunderlich, Physical Chemistry and Polymer
Science
563 Buehler Hall, (865) 974-0652 EMAIL:ATHAS@UTK.EDU
The Advanced Thermal Analysis System page
"The solid state of linear macromolecules is our main research interest. Work is done on the whole spectrum of molecules from flexible polymers (such as polyethylene, polyoxides, nylons, polyesters, selenium, polyphosphates, fluoropolymers, poly(amino acid)s and proteins) to increasingly rigid polymers (such as polyparaxylylene, PEEK, polyoxybenzoate, polyoxynaphthoate, and polyparaphenylene). The molecules are analyzed in the crystalline, glassy, molten, and intermediate (mesophase) states. In particular, conformationally disordered crystals (condis crystals) are being investigated.
The methods of research are modulated differential scanning calorimetry, dynamic mechanical analysis, optical microscopy, X-ray diffraction, atomic force microscopy, solid state NMR, and simulation using the molecular dynamics method. Most of the work is done in cooperation with the Chemical and Analytical Sciences Division of Oak Ridge National Laboratory.
Major emphasis is placed on the interpretation of motion and defects in the various states of matter and the description of the phase transitions. The thermal, chemical, and mechanical history of materials is probed by quantitative study of the hysteresis effects at the glass transition, melting and annealing behavior. It has led, for example, to the discovery of nonequilibrium phases such as "rigid amorphous" fractions in semicrystalline samples and the oriented intermediate phase in fibers.
A special laboratory, ATHAS (Advanced THermal AnalysiS) has been developed with the following goals:
1. To provide a center to carry out and teach thermal analysis
2. To conduct research into the thermal properties of polymers.
3. To develop special instrumentation and its interpretation such as modulated differential scanning calorimetry.
4. To maintain data banks on thermal properties of linear macromolecules."
- Bernhard Wunderlich, Professor and Disinguished Scientist, received his Ph.D. under the direction of Prof. Malcolm Dole at Northwestern University, Evanston, IL in 1957. Professor Wunderlich taught thereafter at Northwestern University (1957-58), Cornell University (1958-63) and Rensselaer Polytechnic Institute (1963-88) before joining UT in 1988.
- Wunderlich, B., Temperature-Modulated Calorimetry of Polymers with Single and Multiple Frequencies to Determine Heat Capacities as Well as Reversible and Irreversible Transition Parameters, Material Characterization by Dynamic and Modulated Thermal Analytical Techniques, ASTM STP 1402, A. T. Riga and L. H. Judovits, Eds., American Society for Testing and Materials, West Conshohocken, PA, 2001, in print.
- B. Wunderlich, Heat Capacity of Polymers in S. Z. D. Cheng Editor, "Handbook of Thermal Analysis and Calorimetry," Vol. III, Elsevier Publ. (2001), in print.
- P. MyÑli½ski, P. Kamasa, A. Wasik, M. Pyda, and B. Wunderlich, Characterization of the Ceramic Coating of Iron with TiN by Temperature-Modulated Thermomagnetometry, Thermal Dilatometry, and DTA. Proc. 28th NATAS Conf. in Orlando, FL, Oct. 4-6, K. J. Kociba and T. Kirchner-Jean, edts., 28, 88-93 (2000).
- J. Pak and B. Wunderlich, Melting and Crystallization of Low Molecular Weight Polyethylene by Calorimetry. Proc. 28th NATAS Conf. in Orlando, FL, Oct. 4-6, K. J. Kociba and T. Kirchner-Jean, 28, 767-769 (2000).
- B. Wunderlich, High Quality Heat Capacity Measurements at Different Frequencies of Temperature Modulation, Proc. 28th NATAS Conf. in Orlando, FL, Oct. 4-6, K. J. Kociba and T. Kirchner-Jean, 28, 140-145 (2000).
- P. Kamasa, M. Pyda, M. Merzlyakov, C. Schick, and B. Wunderlich, Multi-frequency Heat Capacity Measurement by Different Types of Temperature Modulation. Proc. 28th NATAS Conf. in Orlando, FL, Oct. 4-6, K. J. Kociba and T. Kirchner-Jean, 28, 889-894 (2000).
- M. Pyda and B. Wunderlich, Reversible and Irreversible Apparent Heat Capacities of Poly(carbonyl-alt-ethylene-co-propylene) by Temperature-modulated Differential Scanning Calorimetry. Proc. 28th NATAS Conf. in Orlando, FL, Oct. 4-6, K. J. Kociba and T. Kirchner-Jean, 28, 791-796 (2000).
- R. Androsch and B. Wunderlich, Reversing Melting and Crystallization of Indium as a Function of Temperature Modulation, Thermochim. Acta, 364, 181-191 (2000).
- A. Michel, S. Kreitmeier, and B. Wunderlich, Molecular Dynamics Simulations of the Adsorption of Single Chains on Surfaces, in D. P. Landau, S. P. Lewis, and H.-B. Schüttler, edts., "Computer Simulation Studies in Condensed-Matter Physics, XII." Springer Proceedings in Physics, Springer Verlag, Berlin, Vol. 85, 228-231 (2000).
- R. Androsch and B. Wunderlich, Analysis of the Degree of Reversibility of Crystallization and Melting in Poly(ethylene-co-octene), Macromolecules, 33, 9076-9089 (2000).
- Y. K. Kwon, R. Androsch, M. Pyda, and B. Wunderlich, Multi-Frequency Saw-Tooth Modulationof a Power-Compensation Differential Scanning Calorimeter, Thermochim. Acta, (2000) in print.
- W. Chen, I.-K. Moon and B. Wunderlich, Study of Crystallization Kinetics by Temperature-Modulated DSC, Polymer, 41, 4119-4125 (2000).
- M. Pyda, Y. K. Kwon, and B. Wunderlich, Heat Capacity Measurement by Sawtooth Modulated Standard Heat-Flux Differential Scanning Calorimeter with Sample-Temperature Control, Thermochim. Acta, (2000) in print.
- J. Pak, and B. Wunderlich, Heat Capacity by Sawtooth-Modulated, Standard Heat-Flux Differential Scanning Calorimeter with Close Control of the Heater Temperature, Thermochim. Acta (2000), in print.
- M. Pyda and B. Wunderlich, Reversible and Irreversible Heat Capacity of Poly(trimethylene Terephthalate) Analyzed by Temperature-Modulated Differential Scanning Calorimetry, J. Polymer Sci., Part B: Polymer Phys., 38, 622-631 (2000); preprinted in part in B. Wunderlich and M. Pyda, Thermal Properties and Nanophase Structure of Poly(trimethylene terephthalate), Proceedings of the American Chemical Society, Div. of Polymeric Materials: Science and Engineering. Spring Meeting in San Francisco, CA, March 26 to 30, 82, 311-312 (2000).
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