PYROLYSIS-CHROMATOGRAPHY AND PYROLYSIS-SPECTROSCOPY (HPLC, LIQUID CHROMATOGRAPHY, POLYSTYRENE, STYRENE OLIGOMERS).
Item
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Title
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PYROLYSIS-CHROMATOGRAPHY AND PYROLYSIS-SPECTROSCOPY (HPLC, LIQUID CHROMATOGRAPHY, POLYSTYRENE, STYRENE OLIGOMERS).
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Identifier
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AAI8319776
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identifier
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8319776
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Creator
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LAI, SHIH-TSE.
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Contributor
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Davia C. Locke
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Date
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1983
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Analytical
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Abstract
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This dissertation is in three parts: (1) Pyrolysis-Chromatography and Pyrolysis-Spectroscopy, (2) Separation of Styrene Oligomers Using High Performance Liquid Chromatography with UV and Fluorescence Detection, and (3) Multi-Mode Behavior of Chemically Bonded Phases in Liquid Chromatography.;Part One is concerned with the first report of the newly developing methods of pyrolysis-Liquid Chromatography (Py-LC) and pyrolysis-fluorescence; the comparison of stepwise Py-LC and stepwise pyrolysis-gas chromatography (Py-GC); the informative method of off-line Py-LC-MS; and Py-MS with electron impact ion source of polystyrene, which shows a fragment at mass = 180 (1,2-diphenylethylene) that provides evidence of trace amounts of head-to-head microstructure.;Part Two reports the first separations of styrene oligomers on nitrile-bonded phases, PAC (1:2 ratio of nitrile- and amino-bonded phases) and alumina absorbents. Excimer fluorescence emission spectra are also observed on each HPLC fraction of lower styrene oligomers. Fluorescence detection is reported here to monitor HPLC fractionation of styrene oligomers and Size Exclusion Chromatographic (SEC) separation of Polystyrene polymers.;Part Three discusses a factor overlooked by modern LC users, the mobile phase effect. The nitrile bonded phase is used as an example to demonstrate that by changing the mobile phase alone, reversed-phase, normal phase, and size exclusion LC can be conducted on the same stationary phases.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
