Keywords and Phrases
Bound water; Corrosion inhibitors; Polymer dynamics
"This dissertation is subdivided into three topics: Experimental study of colloidal unimolecular polymer (CUP) hydration; probing of polymer chain dynamics by 13C solid state NMR technique; and the anticorrosive effect of 5-mercapto-1, 3, 4-thiadiazole-2(3H)-thione (MTT) derivatives.
The states of water in colloidal unimolecular polymer system were investigated by low field proton NMR. Bound and free water fractions were determined using spin-lattice relaxation measurements. A model equation was used to analyze the inversion recovery data.
The proton cross polarization and the pulse sequence for total spinning sideband suppression CP-TOSS NMR method were developed to determine the chain mobility of polymers as a function of temperature. 13C solid state NMR spectra were analyzed over a temperature range 260K-370°K. Peak intensities of each carbon were plotted verses sample temperature. The plots revealed two linear regions with intersection point close to the first deviation temperature measured by differential scanning calorimetry (DSC).
Finally, various 5-mercapto-1,3,4-thiadiazole-2(3H)-thione (MTT) derivatives were synthesized and tested for their ability to inhibit corrosion on steel and 304 stainless steel substrates in a 3.5% NaCl solution. The effect of structure, substituent size, and steric hindrance on corrosion inhibitor performance were investigated. The size of substituent has a pronounced impact on corrosion inhibition ability."--Abstract, page iii.
Van-De-Mark, Michael R.
Schuman, Thomas P.
Winiarz, Jeffrey G.
Ph. D. in Chemistry
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Surface and bulk water in colloidal unimolecular polymer (CUP) systems investigated by spin-lattice (T1) relaxation measurement
- Probing polymer chain dynamics by 13C solid-state NMR using CP-TOSS
- Anticorrosive effects of derivatized 5-mercapto-1,3,4-thiadiazol-2(3H)-thione (MTT) at the thiol position
xvi, 128 pages
© 2015 Yousef Abobaker Dawib, All rights reserved.
Dissertation - Open Access
Polymer colloids -- Testing
Surface tension -- Measurement
Polymers -- Rheology
Corrosion and anti-corrosives
Electronic OCLC #
Dawib, Yousef Abobaker, "NMR T₁ studies of colloidal unimolecular polymer (CUP) surface water" (2015). Doctoral Dissertations. 2406.