1. Department of Chemistry Eric Senning and James Utterback, Mentors
The Dynamics of the Glass Transition Studied by Molecular Fourier Imaging Correlation Spectroscopy By
Sametra Delaney
University of Oregon
Department of Chemistry
Andrew H. Marcus, Ph.D., PI
Eric Senning and James Utterback, Mentors
Summer 2008
SPUR Student

2. Motivation
Understanding the Mechanism behind the Theory of the nature of glass and the glass transition

3. Contribution To Other Areas of Science?
. Pharm-make a glass stable structure instead of crystalline form, allowing quick dissolving and to be taken orally

4. Physical Properties of Glass
Liquid State
Solid State
Trapped between being a liquid and solid because it contains different regions

5. Glass Solid Phase of a material with no long range molecular order
disordered molecular structure of a liquid and the rigidity of a solid

6. Glass Transition
. The molecules in some regions jam quickly, while in other regions move in a liquid like fashion

7. Materials and Methods Fluorescently doped thin polymer films MFICS
Using polymer films

8. Studied Materials Poly (methyl methacrylate) PMMA
Poly (vinyl acetate) PVAc
We begin with synthetic polymers. dissolve in THF(tetrahydrofuran) to give 5%conc, add solution to polar solvent, dry overnight, freeze dry polymer in THF to remove water/methanol. (twice) filter for particulate matter

9. Glass Transition Polymer Sample Compression Molder
Once polymer is purified, freeze dried twice, and filtered again. Compression molding. The polymer is melted and then cooled above the Tg state. The torque is used to apply pressure during this process.

10. Results
Dyed Samples (with bodipy) and their respective blanks

11. Molecular Fourier Imaging Correlation Spectroscopy
Red beads are the fluorescent probes. MFICS detects the phase of the probes by transmitting a beam through the sample. Green beam light is absorbed and red beam light is emitted (fluoresced). Depending on the position of the particle the interference pattern creates the waveform of the red emitted light. Red comes from red fluorescent light on beads
Amplitude is large and phase = 0
Amplitude is small and phase = π

12. Autocorrelation of phase and amplitude

13. Discussion
The dynamical process of the glass transition is yet to be understood, however, with the result of successful polymer samples, and the capabilities that the Marcus lab and MFICS have to offer, this question is sure to be answered.

14. Acknowledgements Andrew H. Marcus, PhD James Utterback Eric Senning
This work was supported by UO Spur program and FASEB MARC

15. A. Marcus, M. Knowles, T. Grassman
A .Marcus, M. Knowles, T.Grassman. Structure and Dynamics of fluorescently labeled complex fluids by Fourier Imaging Correlation Spectroscopy 2000 M. D. Ediger, C.A Angell, and S. R. Nagel, J.Phys.Chem J.Utterback. Imj Ian Harsey. Imj