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11 September 2008 Zero CTE polyimides for athermal optical membranes
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Polyimides are attractive mirror candidate materials due to their low mass, solar radiation resistance, and cryogenic flexibility. However, polyimides exhibit high coefficients of thermal expansion (CTE) values (40-70 ppm/K), inducing image distortion from CTE mismatch. Additionally, the temperature of large aperture (10 m) membranes is not uniformly controlled in space, further increasing image distortion from anisotropic deformations. The CTE of the MSRS Novastrat polyimide line was adjusted to exhibit CTEs between -16 ppm/K and 53 ppm/K, including 0 ppm/K, 10 ppm/K, 17 ppm/K, and 25 ppm/K corresponding with CTE matches of graphite/epoxy, carbon steel, copper, and aluminum (respectively). The development of these CTE-matched membranes is presented, as well as the effect of the CTE adjustment on the mechanical properties.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Garrett D. Poe and Brian G. Patrick "Zero CTE polyimides for athermal optical membranes", Proc. SPIE 7061, Novel Optical Systems Design and Optimization XI, 706114 (11 September 2008);


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