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Optically transparent/colorless polyimidesSeveral series of linear aromatic polyimide films have been synthesized and characterized with the objective of obtaining maximum optical transparency. Two approaches have been used as part of this structure-property relationship study. The first approach is to vary the molecular structure so as to separate chromophoric centers and reduce electronic interactions between polymer chains to lower the intensity of color in the resulting polymer films. A second and concurrent approach is to perform polymerizations with highly purified monomers. Glass transition temperatures of thermally cured polyimide films are obtained by thermomechanical analysis and thermal decomposition temperatures are determined by thermogravimetric analysis. Transmittance UV-visible spectra of the polyimide films are compared to that of a commercial polyimide film. Fully imidized films are tested for solubility in common organic solvents. The more transparent films prepared in this study are evaluated for use on second-surface mirror thermal control coating systems. Lightly colored to colorless films are characterized by UV-visible spectroscopy before and after exposure to 300 equivalent solar hours UV irradiation and varying doses of 1 MeV electron irradiation. The effects of monomer purity, casting solvent and cure atmosphere on polyimide film transparency are also investigated.
Document ID
19860006910
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Stclair, A. K.
(NASA Langley Research Center Hampton, VA, United States)
Stclair, T. L.
(NASA Langley Research Center Hampton, VA, United States)
Slemp, W.
(NASA Langley Research Center Hampton, VA, United States)
Ezzell, K. S.
(PRC Kentron Inc. Hampton, Va., United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1985
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:87650
NASA-TM-87650
Meeting Information
Meeting: International Conference on Polyimides
Location: Ellenville, NY
Country: United States
Start Date: October 30, 1985
End Date: November 1, 1985
Sponsors: Society of Plastics Engineers
Accession Number
86N16380
Funding Number(s)
PROJECT: RTOP 506-63-91-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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