Doctoral Dissertations

Abstract

"Poly-(p-phenylenepyromellitamic acid)s have been synthesized over the weight average molecular weight range from 8,000 to 22,000 by reaction of pyromellitic dianhydride and p-phenylenediamine in dimethylformamide. The polymers were recovered as amorphous yellow powders having planar dimensions of 3-4 x 1-2 µm with thicknesses of 0.1-0.2 µm and contained 20-30% associated dimethylformamide. Consumption of reactants and attainment of the ultimate molecular weight of the polymer was found to occur within one minute. Thermogravimetry of the solid poly(amic acid)s was used in a method developed to determine the amount of associated dimethylformamide, to study the cyclization of poly(amic acid) to polyimide, and to study the decomposition of the polyimide in air and in argon. Viscometry and light scattering measurements showed that dimethylformamide is a poor solvent for the polymer. The intrinsic viscosity - weight average molecular weight relationship was found to be [η] = 25.22 x 10⁻⁴ M̄w⁰.⁵⁶³ The poly(p-phenylene pyromellitamic acid)s were also characterized by ultraviolet, visible, near infrared, and infrared spectroscopy; differential thermal analysis; vapor pressure osmometry; and gel permeation chromatography"--Abstract, page ii.

Advisor(s)

Mayhan, Kenneth G.

Committee Member(s)

Stoffer, James O.
Zakin, J. L.
Planje, Theodore J., 1919-1980
James, William Joseph

Department(s)

Chemical and Biochemical Engineering

Degree Name

Ph. D. in Chemical Engineering

Sponsor(s)

United States. National Aeronautics and Space Administration
University of Missouri--Rolla. Department of Chemical Engineering
University of Missouri--Rolla. Graduate Center for Materials Research

Publisher

University of Missouri--Rolla

Publication Date

1972

Pagination

xiii, 194 pages

Note about bibliography

Includes bibliographical references (pages 188-194).

Rights

© 1972 Constantine William Tsimpris, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Polymers -- Viscosity
Polyimides
Phenylenediamines

Thesis Number

T 2750

Print OCLC #

6034057

Electronic OCLC #

884585546

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