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Raman and Infrared Imaging of Dynamic Polymer Systems

Bobiak, John Peter
http://rave.ohiolink.edu/etdc/view?acc_num=case1133472157

Abstract Details

2006, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science.
This work aims to expand the applications of Raman and infrared imaging in materials science and engineering. Recent developments in spectroscopic imaging technology have led to relatively fast image acquisition rates, enabling the in situ analysis of various engineering processes. A brief review of spectroscopic imaging principles and existing applications is provided as background before three novel applications are set forth. First, the effectiveness of FTIR imaging for modeling polymer dissolution behavior was examined in a series of binary poly (methyl methacrylate) (PMMA) systems. The dissolution behavior was influenced by polymer conformation as well as the solvent characteristics. The results indicate that chemistry alone is a poor predictor of dissolution rate. Rather, the diffusion coefficients of both the polymer and solvent have a foremost impact on the dissolution process. One major complication in modeling diffusion-related process by FTIR imaging is the precise determination of component locations in a series of images. This issue is addressed through the introduction of a new position-reporting technique based on hypothesis testing. A rudimentary drug release system, consisting of a poly (ethylene-co-vinyl acetate) film and a nicotine solution, was used to illustrate the importance of precisely reporting the nicotine diffusion front position. The new reporting method provided an inherent level of certainty to the position report. This method was applied to qualitatively assess the uptake of nicotine from solutions containing different solubilizing agents, which were capable of either promoting or inhibiting nicotine uptake. Finally, Raman mapping and Raman line imaging were used to classify individual carbon nanotubes that were dispersed on a substrate. Individual nanotubes displayed a range of spectral characteristics, indicating that the bulk sample was a mixture of materials with different graphitic domain sizes. The results from images acquired by Raman mapping were identical to those acquired by line imaging. These results establish line imaging as a relatively fast, effective method to analyze heterogeneous nanotube samples.
Jack Koenig (Advisor)
128 p.
spectroscopic imaging; Raman imaging; Raman mapping; FTIR imaging; Infrared imaging; Polymer dissolution; Drug diffusion; Single-walled carbon nanotubes

Recommended Citations

Citations

  • Bobiak, J. P. (2006). Raman and Infrared Imaging of Dynamic Polymer Systems [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1133472157

    APA Style (7th edition)

  • Bobiak, John. Raman and Infrared Imaging of Dynamic Polymer Systems. 2006. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1133472157.

    MLA Style (8th edition)

  • Bobiak, John. "Raman and Infrared Imaging of Dynamic Polymer Systems." Doctoral dissertation, Case Western Reserve University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1133472157

    Chicago Manual of Style (17th edition)

case1133472157
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© 2005, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.