High-performance polymers have found an extreme range of applications in the aerospace industry. Composites which have polymers incorporated in them can usually meet the needs of the design, and are the ideal materials for aerospace applications due to their light weight, high strength, and radar transparency. Phenyl-ethynyl terminated oligomers, for example, have found many uses in the aerospace industry. Phenyl-ethynyl terminated oligomers (AFR-PEPA-N) exhibit glass-transition temperatures of up to 450°C. Unfortunately crystals form due to interactions of the oligomers. These crystals do not melt until 360°C after 15 minutes when the resin is already 50% cured. Investigation was performed to find any possible alteration to the end-caps and monomer chain elements of the current AFR-PEPA-N. Several siloxane related amines were added to the AFR-PEPA-N chain to form protective coatings when in service at high temperatures. The new poly(siloxane imide) showed an increase in processability while mantaining AFR-PEPA-N properties. In addition, phenyl-ethnyl end-caps were substituted with an ethynyl end-caps which showed no improvement in processability.

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Some new inorganic and organometallic derivatives of methylcyclosiloxanes have been prepared and characterized by IR, MS and ('1)H NMR. Compounds, {CH(,3)(Br)SiO}(,3) and {CH(,3)(Br)SiO}(,4) were prepared by cleavage of silicon-phenyl bond with bromine at low temperature. The reaction of {CH(,3)(Br)SiO}(,3) with Na(sec-butyl)(,3)BH at low temperature produced the highly reactive trimer, {CH(,3)(H)SiO}(,3). Compounds {CH(,3)(Co(CO)(,4))SiO}(,4), {CH(,3)(Fe(CO)(,2)(eta)('5)-C(,5)H(,5))SiO}(,4), and {CH(,3)(Co(CO)(,4)SiO}(,5) were prepared by the hydrogen elimination reaction of {CH(,3)(H)SiO}(,n), n = 4 and 5 with Co(,2)(CO)(,8) and {Fe(CO)(,2)(eta)('5)-C(,5)H(,5)}(,2). It was also possible to isolate the compound {CH(,3)(Co(CO)(,4))SiO}(,1){CH(,3)(Fe(CO)(,2)(eta)('5)-C(,5)H(,5))SiO}(,3) by reacting {CH(,3)(H)SiO}(,1){CH(,3)(Fe(CO)(,2)(eta)('5)-C(,5)H(,5))SiO}(,3) with a stoichiometric amount of Co(,2)(CO)(,8). A detailed study of mass spectra of {CH(,3)(R)SiO}(,n), where R = H, (n = 4, 5, and 6), R = C(,6)H(,5), (n = 3 and 4), R = Br, (n = 3 and 4), R = Co(CO)(,4), (n = 4 and 5) and R = Fe(CO)(,2)(eta)('5)-C(,5)H(,5), (n = 4) was achieved. Compounds R = Co(CO)(,4) show stepwise loss of all CO groups from ions {M}('+(.)), {M-Co(CO)(,4)}('+), and also {M}('++). A simple empirical approach based on the chemical environment of methyl protons was used to assign ('1)H NMR spectra of geometric isomers of substituted methylcyclosiloxanes. The total assignment of ('1)H NMR spectra allowed the determination of the isomeric composition of most new compounds mentioned above.

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The research reported in this thesis has been divided into five separate categories - Synthesis of dialkali metal silanediolate and siloxanediolate salts, - Synthesis of siloxane copolymers using interfacial condensation polymerisation, - Synthesis of silicon-organic copolymers using interfacial condensation polymerisation, - Investigation into the analysis of polymers using size exclusion chromatography, and - Theoretical investigation into TMDSC analysis of polymers. / Thesis (PhDAppliedScience)--University of South Australia, 2000.

Thesis (MAppSc)--University of South Australia, 1997

Thesis (MAppSc)--University of South Australia, 1997

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 188-194). Also available via the Internet.

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