NDLI: Larc-ia: a flexible backbone polyimide

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Larc-ia: a flexible backbone polyimide

Content Provider	NASA Technical Reports Server (NTRS)
Author	Stclair, Terry L. Progar, Donald J.
Copyright Year	1990
Description	A new linear, aromatic, thermoplastic polyimide, prepared from oxydiphthalic anhydride (ODPA) and 3,4'-oxydianiline (ODA) in diglyme and identified as LARC-IA, was synthesized and evaluated. The monomers are relatively inexpensive and physiologically safe. Molecular weight was controlled by use of a monofunctional anhydride, phthalic anhydride (PA), in order to promote controlled flow and wetting properties. The polymer is considered a safe alternative to commercially available LARC-TPI which is prepared with an expensive diamine of uncertain carcinogenicity. The evaluation was based primarily on the polymer's adhesive properties as determined by thermal and water boil exposure of lap shear specimens. Strengths were determined at room temperature, 177, 204 and 232 C before and after exposure to determine the adhesive system's durability to adverse environments over a period of time. Other properties (FWT, G(1c), film and composite properties) were examined which were determined to be typical of a high temperature polyimide. Results of the study show a favorable comparison to LARC-TPI, a commercially available polyimide.
File Size	1376976
Page Count	40
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900007610
Archival Resource Key	ark:/13960/t6c29sv6k
Language	English
Publisher Date	1990-01-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Anhydrides Wetting Durability Synthesis Chemistry High Temperature Flexibility Adhesion Monomers Molecular Weight Diamines Carcinogens Adhesives Low Cost Polyimides Chemical Bonds Thermoplasticity 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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