NDLI: Polyimides containing pendent siloxane groups

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Polyimides containing pendent siloxane groups

Content Provider	NASA Technical Reports Server (NTRS)
Author	Connell, John W.
Copyright Year	1991
Description	The incorporation of siloxane units into the backbone of aromatic polyimides has been shown to impart certain advantages over the unmodified polyimides. These include enhanced solubility, lower moisture adsorption, lower dielectric constant, improved toughness and surface modification. Also, when exposed to an atomic oxygen environment these materials form an in-situ silicate (SiO2) surface coating which protects the underlying material from further erosion. These unique advantages make polyimide-siloxanes useful in a variety of electronic and aerospace applications. As part of an effort on high performance polymeric materials for potential aerospace applications, polyimides containing pendent siloxane groups are under study. These materials were prepared by reacting a functionalized siloxane compound with polyimides containing benzhydrol groups. Thin films of the polymers exhibited glass transition temperatures ranging from 167 to 235 C. Tensile strengths and moduli measured at 23 C ranged from 11 to 14 ksi and 250 to 450 ksi, respectively. The dielectric constant was lowered substantially from that of the unmodified polyimide.
File Size	435386
Page Count	9
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920013219
Archival Resource Key	ark:/13960/t3gx9707z
Language	English
Publisher Date	1991-12-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Siloxanes Moisture Solubility Silicates Glass Transition Temperature Silicon Dioxide Aerospace Engineering Thin Films Toughness Oxygen Atoms Adsorption Polyimides Coating Permittivity Erosion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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