Masters Theses

Abstract

"One of the common methods used in film formation is the solvent evaporation method. As the evaporation starts the viscosity increases due to the inability of the solvent to keep the chains apart, which leads to a drag between molecules.

The rate of evaporation of the solvent (loss of solvent) cannot be equated with the rate of drying, since the latter depends on the results of the loss of solvents in terms of viscosity and plastic properties. The drying time can be defined as the rate at which a film increases its viscosity and thus changes the properties of a simple liquid to those of a plastic solid.5

If the evaporation rate is very fast the consistency of the film increases rapidly after film application and the polymer molecules have less opportunity to align themselves in the best position for maximum film strength. In addition, if the solvent is a relatively poor one for the polymer, the consistency of the film increases even more rapidly with solvent evaporation, giving the molecules less opportunity for most favorable alignment. The effect of the solvent is to separate the crystalline areas and also to separate the random parts of a chain from neighboring chains by solvent molecules.18

When coating materials are applied as a solution, orientation of the molecules occurs provided the solvent does not evaporate so rapidly that the molecules are immobilized before they can orient to the best advantage.

The influence of the drying time of a solution of a linear polymer on the stress-strain behavior, and the protection against corrosion were studied in this thesis. The stress-strain behavior of the material, which is one of the most important mechanical properties, is very important since it determines primarily the use of plastics, rubbers, and fibers.15 The stress-strain measurements involve the study of tensile strength, elongation, and modulus of elasticity.

The polymer resin used in this research was the copolymer vinyl chloride - vinyl acetate. It is the most important vinyl resin for surface coating. The commercial type Vinylite VYHH resin was used.

The stress-strain measurements were run in the Research Center of the Monsanto Chemic al Company in St. Louis, Mo. The protection against corrosion test was carried out in the salt fog box, in which moisture and ion permeability through the polymer film cause the corrosion of under film iron vapor deposited on glass panels"--Introduction, pp. 1-2

Advisor(s)

Bosch, Wouter

Committee Member(s)

Proctor, Paul Dean, 1918-1999
Russell, Robert R.
Hagni, Richard D.

Department(s)

Chemistry

Degree Name

M.S. in Chemistry

Publisher

University of Missouri at Rolla

Publication Date

1964

Pagination

viii, 97 pages

Note about bibliography

Includes bibliographical references (pages 93-95)

Rights

© 1964 Abd El-Rahman M. Naser, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 1585

Print OCLC #

5958350

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Chemistry Commons

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