An investigation of proton magnetic resonance in stearic acid, sodium stearate and potassium stearate
department or school: Science, Faculty of
department or school: Chemistry, Department of
data provider: DSpace
degree campus: UBCV
creator: Grant, Rowland Frederick
issued: 2011-12-13T00:42:43Z
issued: 1959
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: The proton magnetic resonance absorption has been measured in stearic acid, anhydrous sodium stearate and anhydrous potassium stearate. The temperature dependence of the widths and second moments of the proton magnetic resonance absorption lines of these compounds is discussed. The proton magnetic resonance absorption in the C-form of stearic acid has been measured between -188°C and the melting point. The results suggest that the methyl end groups may be free to rotate about their C₃ axes above -77°C and that pre-melting becomes significant above 40°C. The proton magnetic resonance absorption in anhydrous sodium stearate has been investigated between -182°C and 200°C. An abrupt change in the line width and second moment has been observed between 113°C and 114°C, the supercurd to subwaxy phase transition. The results suggest that, at temperatures below 114°C, the motion of the hydrocarbon chain portion of the sodium stearate molecule is chiefly one of oscillation or rotation about the chain longitudinal axis. The hydrocarbon chains may be free to move about other axes above 114°C, although the molecule as a whole retains a fixed position in the crystal lattice. The proton magnetic resonance absorption in anhydrous potassium stearate has been measured from -190°C to 182°C. Abrupt changes in the line width have been observed between 55°C and 62°C and at 171°C; these changes correspond to known phase transitions. The second moment results suggest that some torsional oscillation may occur about the longitudinal axes of the hydrocarbon chain portion of the potassium stearate molecule, at temperatures below 55°C. Above 62°C, contact between the molecules may have decreased enough to allow some lateral motion of the hydrocarbon chains.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/39655
note: AN INVESTIGATION OF PROTON MAGNETIC RESONANCE IN STEARIC ACID, SODIUM STEARATE AND POTASSIUM STEARATE by ROWLAND FREDERICK GRANT B.A., University of Brit i s h Columbia, 195S ffi.Sc, University of Br i t i s h Columbia, 1955 A THESIS SUBMITTED IN PARTIAL FUI^IIMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY In the Department of Chemistry We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA ; December, 1959 In presenting t h i s t h e s i s i n p a r t i a l f u l f i l m e n t of the requirements f o r an advanced degree at the U n i v e r s i t y of B r i t i s h Columbia, I agree that the L i b r a r y s h a l l make i t f r e e l y a v a i l a b l e f o r reference and study. I f u r t h e r agree that permission f o r extensive copying of t h i s t h e s i s f o r s c h o l a r l y purposes may be granted by the Head of my Department or by h i s r e p r e s e n t a t i v e . I t i s understood that copying or p u b l i c a t i o n of t h i s t h e s i s f o r f i n a n c i a l gain s h a l l not be allowed without my w r i t t e n permission. Department of Chemistry The U n i v e r s i t y of B r i t i s h Columbia, Vancouver 8 , Canada. Date December 5, 1959. GRADUATE STUDIES Field of Study: Chemistry Physical Chemistry Seminar Quantum Chemistry Thermodynamics Molecular Structure Chemical Kinetics Molecular Rearrangements . Others Studies: C. Reid H. M. Daggett, Jr. { B. A. Dunell W. A. Bryce A. Rosenthal Electricity and Magnetism J. M. Daniels Theoretical Mechanics F. A. Kaempffer Differential Equations T. E. Hull PUBLICATIONS 1. Nuclear Magnetic Resonance Study of Phase Transitions in Anhy-drous Sodium Stearate, R. F. Grant, N. Hedgecock, and B. A. Dunell, Can. J. Chem., 34, 1514- 1517 (1956) 2. Proton Magnetic Resonance Absorption in the C-form of Stearic Acid, R. F. Grant and B. A. Dunell, Can. J. Chem., 38, 359 - 364 (1960). Faculty of Graduate Studies PROGRAMME OF THE FINAL ORAL E X A M I N A T I …
has type: Thesis/Dissertation
is shown at: 10.14288/1.0062025
language: eng
degree discipline: Chemistry
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/39655