NDLI: Organosiloxane working fluids for the liquid droplet radiator

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Organosiloxane working fluids for the liquid droplet radiator

Content Provider	NASA Technical Reports Server (NTRS)
Author	Buch, R. R. Huntress, A. R.
Copyright Year	1985
Description	Siloxane-based working fluids for advanced space radiators requiring direct fluid exposure to the space environment are evaluated. Isolation of five candidate fluids by vacuum distillation from existing siloxane polymers is discussed. The five fluids recovered include a polydimethylsiloxane, three phenyl-containing siloxanes, and a methylhexylsiloxane. Vapor pressures and viscosities for the five fluids are reported over the temperature range of 250 to 400 K. Use of thermal-gravimetric analysis to reliably estimate vapor pressures of 10 to the -8 power Pascals is described. Polydimethylsiloxane (PDMS) and polymethylphenylsiloxane (PMPS) are selected from the five candidate fluids based on favorable vapor pressure and viscosity, as well as perceived stability in low-Earth orbit environments. Characterization of these fluids by infrared spectroscopy, Si-29 NMR, gel-permeation chromatography, and liquid chromatography is presented. Both fluids consist of narrow molecular weight distributions, with average molecular weights of about 2500 for PDMS and 1300 for PMPS.
File Size	7393545
Page Count	172
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860006911
Archival Resource Key	ark:/13960/t2q57gn30
Language	English
Publisher Date	1985-12-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Viscosity Earth Orbital Environments Infrared Spectroscopy Stability Low Earth Orbits Vapor Pressure Siloxanes Spacecraft Radiators Thermogravimetry Working Fluids Liquid Chromatography Drops Liquids Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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