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Record Details

Record 85 of 51847
Polymers in solar energy utilization
Author and Affiliation:
Liang, R. H.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Coulter, D. R.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Dao, C.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Gupta, A.(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, A, United States)
Abstract: A laser photoacoustic technique (LPAT) has been verified for performing accelerated life testing of outdoor photooxidation of polymeric materials used in solar energy applications. Samples of the material under test are placed in a chamber with a sensitive microphone, then exposed to chopped laser radiation. The sample absorbs the light and converts it to heat by a nonradiative deexcitation process, thereby reducing pressure fluctuations within the cell. The acoustic signal detected by the microphone is directly proportional to the amount of light absorbed by the specimen. Tests were performed with samples of ethylene/methylacrylate copolymer (EMA) reprecipitated from hot cyclohexane, compressed, and molded into thin (25-50 microns) films. The films were exposed outdoors and sampled by LPAT weekly. The linearity of the light absorbed with respect to the acoustic signal was verified.Correlations were established between the photoacoustic behavior of the materials aged outdoors and the same kinds of samples cooled and heated in a controlled environment reactor. The reactor tests were validated for predicting outdoor exosures up to 55 days.
Publication Date: Jan 01, 1983
Document ID:
19830066605
(Acquired Nov 30, 1995)
Accession Number: 83A47823
Subject Category: NONMETALLIC MATERIALS
Document Type: Conference Paper
Publisher Information: United States
Meeting Information: Polymers in solar energy utilization; Symposium; March 28, 1982-April 2, 1982; Las Vegas, NV
Meeting Sponsor: U. S. Department of Energy;
NASA
Financial Sponsor: NASA; United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 9p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACCELERATED LIFE TESTS; LASER SPECTROSCOPY; PHOTOACOUSTIC SPECTROSCOPY; PHOTOOXIDATION; POLYMERS; SOLAR CELLS; ABSORPTION SPECTRA; PHOTOABSORPTION; PRODUCTION COSTS; SOLAR ENERGY ABSORBERS
Imprint And Other Notes: IN: Polymers in solar energy utilization; Proceedings of the Symposium, Las Vegas, NV, March 28-April 2, 1982. Washington, DC, American Chemical Society (ACS Symposium Series, No. 220), 1983, p. 265-273. Research sponsored by the U.S. Department of Energy and NASA.
Availability Source: Other Sources
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