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Photothermal degradation of ethylene/vinylacetate copolymerPhotothermal degradation studies were conducted on a 'stabilized' formulation of ethylene/vinyl acetate copolymer (EVA) in the temperature range 25-105 C under three different oxygen environments (in open air, with limited access to O2, and in a dark closed stagnant oven). These studies were performed in order to evaluate the utility of EVA as an encapsulation material for photovoltaic modules. Results showed that at low temperature (25 C), slow photooxidation of the polymer occurred via electronic energy transfer involving the UV absorber incorporated in the polymer. However, no changes in the physical properties of the bulk polymer were detected up to 1500 hours of irradiation. At elevated temperatures, leaching and evaporation of the additives occurred, which ultimately resulted in the chemical crosslinking of the copolymer and the formation of volatile photoproducts such as acetic acid.
Document ID
19830065499
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Liang, R. H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chung, S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Clayton, A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Di Stefano, S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Oda, K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hong, S. D.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gupta, A.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Nonmetallic Materials
Accession Number
83A46717
Distribution Limits
Public
Copyright
Other

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