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Synthesis of novel polyimides for the testing of structure-processing and property relations when used to form high temperature polymer matricesTschen Molina, Francisco 25 April 2007 (has links)
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
450ðC. Unfortunately crystals form due to interactions of the oligomers. These crystals
do not melt until 360ðC 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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Phase behavior of the first three members of the linear dimethylsiloxane series /Lindley, Daniel Dale January 1983 (has links)
No description available.
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Palladium catalysed cross-coupling of disiloxanesBoehner, Christine Monika January 2011 (has links)
No description available.
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Synthesis and characterization of a new class of silyl-transition metal compoundsPelletier, Emilien. January 1983 (has links)
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 irradiation chemistry of methylsiloxanes adsorbed on silica.Maeng, Ki-Suck January 1969 (has links)
No description available.
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New siloxane sealant materials /Clarke, Stephen Ross. Unknown Date (has links)
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.
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The development and characterisation of new silicon materials /Folland, Peter David Unknown Date (has links)
Thesis (MAppSc)--University of South Australia, 1997
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The development and characterisation of new silicon materials /Folland, Peter David Unknown Date (has links)
Thesis (MAppSc)--University of South Australia, 1997
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Siloxane modified hybrid materials by the sol-gel process /Joardar, Saikat Sutej. January 1992 (has links)
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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The irradiation chemistry of methylsiloxanes adsorbed on silica.Maeng, Ki-Suck January 1969 (has links)
No description available.
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