Develop silicone encapsulation systems for terrestrial silicon solar arrays. Fourth quarterly progress report, January 1-March 31, 1979 [electronic resource].
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1979.
- Physical Description:
- Pages: 33 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Samples of silicone materials with known weatherability have been exposed in the Atlas Filtered Weather-Ometer for over 4,000 hours. During the current quarter all of the silicone resins with appreciable phenyl content showed more degradation than samples exposed to natural weathering. All of the elastomeric silicone materials with small or negligible phenyl content did not visibly change. After 75 temperature cycles from room temperature to 40.5/sup 0/C at 90 to 95% relative humidity there was no appreciable change in the short circuit (I/sub sc/) cell currents using any of the encapsulation concepts. After 50 days of exposure to 90 to 95% relative humidity at 70/sup 0/C these samples had I/sub sc/ values within experimental error of the initial values. The outdoor exposure samples have attained a total of 200 days exposure and the I/sub sc/ values show relatively wide variations. One outdoor exposure sample failed due to loss of adhesion of the DOW CORNING X1-2561 encapsulant to the glass substrate. This caused an open circuit due to lifting of the metallization from the cell surface. The temperature cycling test from -40/sup 0/C to +90/sup 0/C caused visible cracks in all of the encapsulation concepts except for DOW CORNING Q1-2577 as a protective coating both on Super Dorlux and under Solatex glass, DOW CORNING 808 Resin under Solatex Glass and the blend of DOW CORNING 840 Resin with B48N acrylic resin on Super Dorlux. Cracks in all the other encapsulation systems were visible after five cycles and became progressively worse through 15 cycles. uv absorbing agents were incorporated in DOW CORNING Q1-2577, DOW CORNING 840/B48N and DOW CORNING 808 Resin. The uv screening agents used were Permasorb MA, Uvinul N-539 and Uvinul N-35. All of these show promise for use as screens to protect photosensitive polymers. (WHK)
- Report Numbers:
- E 1.99:doe/jpl/954995-4
- Published through SciTech Connect.
Dow Corning Corp., Midland, MI (USA)
- Funding Information:
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