Arylenesiloxane Polymers for Use as High-Temperature Aircraft Integral Fuel Tank Sealants. Part 2. Synthesis and Properties of Alkyl- and Fluoroalkyl- Substituted Alkarylenesiloxane Monomers and Polymers
Summary rept. Aug 1972-Aug 1975
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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In order to predict the molecular structures of arylenesiloxane polymers which would exhibit the optimum combinations of desired properties for high-temperature fuel-resistant sealant applications, it was found necessary to first develop pertinent structure-property correlations. To achieve the latter, new specifically-tailored monomeric alkyl- and fluoroalkyl-substituted alkarylene organosilicon compounds were synthesized and characterized. The bis-silanols were both homopolymerized as well as copolymerized with appropriate bis-aminosilanes or -disiloxanes by various condensation techniques to yield representative alkarylenesiloxane polymers. These were fully characterized with regard to chemical composition, molecular weight, thermal stability, glass-transition temperature and fuel insolubility. The polymers were also cured by means of organic peroxides and the vulcanizates evaluated for swell resistance to solvents and jet fuels.
- Polymer Chemistry