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Full-Text Articles in Physical Sciences and Mathematics
The Effect Of Added Substances On The Volume Change Of Cement, Owen Eugene Brown
The Effect Of Added Substances On The Volume Change Of Cement, Owen Eugene Brown
Honors Theses
There are many substances which effect the volume change of cement during setting, but the lack of time has limited the number and kind of substances used during this research. The effect of salts, or electrolytes, is shown, varying not only the valence of the cation, but also the valence of the anion. A relatively small portion of the existing salts was employed in this work, but they were so chosen as to give a complete picture of their effect on the volume change of cement.
Inhibition Of The Thermal Polymerization Of Styrene, Lester Allan Cohen
Inhibition Of The Thermal Polymerization Of Styrene, Lester Allan Cohen
Honors Theses
The purpose of this work is to study the rate of reaction and mechanism of various inhibitors in the thermal, uncatalyzed polymerization of styrene. Other attempts have been made to study the inhibitory process, the most recent making use of a dilatometer to measure volume changes during the course of polymerization. However, this method, and others, represents indirect means of study. The spectrophotometric method of study presented here, offers a simple and direct method for determining the rate of disappearance of an inhibitor in the inhibition process, and also affords a method calculating the rate constants for the initiation stage …
The Correlation Of The Ultraviolet Absorption Spectra Of Benzotriazole With Its Molecular Structure, John Edward Fagel Jr.
The Correlation Of The Ultraviolet Absorption Spectra Of Benzotriazole With Its Molecular Structure, John Edward Fagel Jr.
Honors Theses
The purpose of this research was to derive, on a theoretical basis, a correlation between the ultraviolet absorption spectra and the molecular structure of benzotriazole. The ultraviolet spectra of buffered aqueous solutions of benzotriazole at numerous pH values from strong acid to strong base have been determined with a Model DU Beckman Spectrophotometer, and an attempt has been made to correlate these spectra with the molecular structure of the compound. As a check on the validity of the theory proposed in correlating the absorption spectra with the molecular structure, the spectra of a 5, (6) – chlorobenzotriazole have been determined …
Artificial Weathering Of Creosote With Water And Oxygen, Kenneth Curtis Heckler
Artificial Weathering Of Creosote With Water And Oxygen, Kenneth Curtis Heckler
Honors Theses
There are many experiments being carried on in the field of wood preservation partially because of the variations in the toxicity of many preservatives. The commercial interest is along the lines of expense, since some preservatives have not proven satisfactory because after a short period of time attack by fungus and insects has set in. This thesis is concerned chiefly with the effects of oxidation and leaching. These factors have been insufficiently investigated to produce conclusive evidence on their effects on the toxicity of creosote. Since the other components of air are thought to have little effect on the toxicity …
Test Results For A New Toximetric Method For Evaluating Wood Preservatives; Toxicity Of Vacuum Rectified Fractions Of Coal-Tar Creosote, Clayton Edward Hathaway
Test Results For A New Toximetric Method For Evaluating Wood Preservatives; Toxicity Of Vacuum Rectified Fractions Of Coal-Tar Creosote, Clayton Edward Hathaway
Honors Theses
“Wood preservation – The art of protecting timber against the action of destructive agents. Usually refers to the treatment of wood with chemical substances (preservatives) which reduce its susceptibility to deterioration by fungi, insects, or marine borers. (2) This is the definition proposed for adoption at the forty-third annual meeting of the American Wood-Preserver’s Association in April, 1950. The work in this project was performed to accomplish a two-fold purpose: 1. Determine the inhibitive action of alcohols and amines using a new method of preparing the poisoned malt-agar medium and defining inhibition point. 2. Check the results obtained from this …
A Modified Agar Test Method For Wood Preservatives, Robert Earl Hayes
A Modified Agar Test Method For Wood Preservatives, Robert Earl Hayes
Honors Theses
The principal criteria for a good wood preservative involves the following considerations 1. The preservative must be sufficiently toxic to curb the action of the wood rotting fungi and wood attacking insects 2. The preservative must not attack wood 3. The preservative must not undergo a chemical or physical change brought upon by contact with the wood cells so as to render the chemical agent non-toxic or less toxic 4. The preservative must not be a substance which will attack metals 5. The preservative must be of such a nature as to make it easily injected into wood 6. The …
Study Of The Hofmann Reaction Between Sodium Hypochlorite And Succinamide. Preparation Of Isopropylidene Bis-Phenylen Oxydiacetic Acid. Preparation Of Polyamides, Frederick E. Heinemann
Study Of The Hofmann Reaction Between Sodium Hypochlorite And Succinamide. Preparation Of Isopropylidene Bis-Phenylen Oxydiacetic Acid. Preparation Of Polyamides, Frederick E. Heinemann
Honors Theses
In the Hofmann reaction between succinamide and potassium hypobromite, small yields of dihydrouracil have been obtained. From the reaction of succinamide and sodium hypochlorite it was hoped that larger yields of the dihydrouracil could be obtained and through spectrophotometry identify the compound further.
A Modified Agar Test Method For Wood Preservatives, Robert Earl Hayes
A Modified Agar Test Method For Wood Preservatives, Robert Earl Hayes
Honors Theses
There are two possible methods by which wood could be protected from the attack of saprophytic fungus growth. Either the conditions can be so controlled as to be unfavorable for the growth of the attacking organism, or the wood can be permeated with a poisonous substance which will in some way disrupt the vital processes of the fungus. It is the obvious that the first suggested preventative would not at all be practical due to the wide geographical range over which wood is used and to the various types of weather conditions to which it may be subjected. Consequently, the …
Iodine Monochloride Investigations, Julian Richard Mayer
Iodine Monochloride Investigations, Julian Richard Mayer
Honors Theses
The purpose of the research was to investigate the reactions of iodine monochloride with non-aromatic and aromatic compounds. The role which this reagent plays in these reactions, the use of various catalysts, and the products obtained were to be studied. It was the immediate object of these investigations to attempt a synthesis of cyclohenzyl iodine directly from cyclohezene using iodine monochloride as the iodinating agent. In studying the non-aromatic compounds in this project, cyclohexene was chosen since it is readily available and yields a single product upon mono-substitution. The major portion of this thesis is concerned with the reaction which …
Preparation Of 2, 4-Dichloro-Α-Chlorostyrene, Walter A. Neumann
Preparation Of 2, 4-Dichloro-Α-Chlorostyrene, Walter A. Neumann
Honors Theses
Styrene and various substituted styrenes have found wide application in the formation of polymers and copolymers, such as synthetic rubbers. Substituted styrenes have been investigated in attempts to develop polymers with special physical properties, a high dielectric constant for an example. α-methylstyrenes have been successfully copolymerized by Bachman and Finholt while α-chlorostyrene seems unreactive toward polymerizing agents.
Collodial Behavior Of "Ludox" Silica Sol, Ralph Herbert Petrucci
Collodial Behavior Of "Ludox" Silica Sol, Ralph Herbert Petrucci
Honors Theses
The preliminary nature of this present study of Ludox should open up many avenues of approach to future workers in this field and we shall try in some of the following sections to suggest future work.
Colorimetric Analysis Of Thallium, Arthur Dodd Snyder Jr.
Colorimetric Analysis Of Thallium, Arthur Dodd Snyder Jr.
Honors Theses
The work represented by this paper was performed as a continuation of the research done by Leo P. Richards. Very little literature can be found concerning the colorimetry of thallium. Therefore this thesis will deal with an attempt to develop a colormetric analysis for thallium.