Title page for ETD etd-08012012-040155


Type of Document Master's Thesis
Author Noell, John Lee Watson
URN etd-08012012-040155
Title The preparation and characterization of PEK/TEOS glasses by the sol-gel method
Degree Master of Science
Department Chemical Engineering
Advisory Committee
Advisor Name Title
Wilkes, Garth L. Committee Chair
Conger, William L. Committee Member
Gibson, Harry W. Committee Member
Keywords
  • Macromolecules
Date of Defense 1987-07-05
Availability restricted
Abstract
Over the last twenty years, substantial emphasis has been placed on the development

of a new class of inorganic glasses using the sol-gel approach. This technique utilizes metal

alkoxide precursors such as tetraethylorthosilcate (TEOS) to build an inorganic glass matrix

out of solution by a two step poly(hydrolysis-condensation) reaction mechanism. The benefits

of making ceramics by this method include considerable energy savings due to the lower

sintering temperatures required to form the densified glass and the ability to produce multi-component

amorphous materials that can not be made through the traditional firing processes.

As a result of this last possibility, polymer researchers have sought to develop spin-off

hybrid inorganic-organic network systems that can be prepared by the sol-gel method using

reactively functionalized oligomers and/or monomers along with the metal alkoxide precursors.

These types of organically modified multi-component glasses could have enormous potential

from an applications standpoint because the system’s mechanical and physical

features can be tailored in accordance to the organic and polymeric materials chosen.

One such inorganic-organic system prepared by this procedure is the new PEK/TEOS

glasses. The PEK represents the bisphenol-A polyarylene ether either ketone thermoplastic

polymer endcapped with triethoxysilane functional groups. By mixing the PEK and

TEOS components at different weight compositions in the starting sol-gel reaction solution,

change in the mechanical properties is observed as the TEOS content is increased for the final,

thin film glasses. Also, a poor extent of reaction or degree of incorporation of the PEK

oligomer is revealed which has been attributed to the vitrification of the glass before the PEK

endgroups have a chance to react. To alleviate this problem, thermal treatments are employed

to further the sol-gel reaction and to complete the network formation in the PEK/TEOS

glasses. After the thermal treatments, the change in the mechanical and physical properties are monitored, and the data retlects systematic trends in regards to the TEOS content and the

temperature of the thermal treatment utilized. In addition to these results, some speculative

information is provided on the temperature sensitivity and the rate of curing of the PEK/TEOS

glasses during the thermal treatments.

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