Photovoltaic manufacturing technology (PVMaT). Semiannual subcontract report, March 31, 1994--September 30, 1994

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The following highlights key findings from this reporting period: while {open_quotes}standard cure{close_quotes} A9918P ethylene vinyl acetate (EVA) encapsulant, laminated between low iron glass, shows significant yellowing after 17 weeks in a xenon-arc Weather-Ometer, {open_quotes}neat{close_quotes} EVA with no additives shows little or no yellowing after the same exposure; when similar laminates were prepared and exposed in the Weather-Ometer, using A9918P with the Lupersol 101 crosslinker removed from the encapsulant, color development after 10 weeks was reduced by approximately 2/3. This result strongly implicates Lupersol 101 in the discoloration of EVA encapsulant; similar Weather-Ometer aging studies of other laminates, prepared using EVA ... continued below

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31 p./1.2 MB

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Holley, W. April 1, 1995.

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Description

The following highlights key findings from this reporting period: while {open_quotes}standard cure{close_quotes} A9918P ethylene vinyl acetate (EVA) encapsulant, laminated between low iron glass, shows significant yellowing after 17 weeks in a xenon-arc Weather-Ometer, {open_quotes}neat{close_quotes} EVA with no additives shows little or no yellowing after the same exposure; when similar laminates were prepared and exposed in the Weather-Ometer, using A9918P with the Lupersol 101 crosslinker removed from the encapsulant, color development after 10 weeks was reduced by approximately 2/3. This result strongly implicates Lupersol 101 in the discoloration of EVA encapsulant; similar Weather-Ometer aging studies of other laminates, prepared using EVA with various combinations of the A9918P additives, suggests that EVA discoloration arises primarily from Naugard P and an interaction of Lupersol 101 with Cyasorb UV-531. Transformation products of these additives appear to be giving rise to yellowing, rather than the Elvax 3185 resin itself; when Lupersol TBEC was substituted for Lupersol 101 in the encapsulant (i.e. {open_quotes}fast cure{close_quotes} 15295P formulation rather than the {open_quotes}standard cure{close_quotes} A9918P), the rate of yellowing was reduced by a factor of approximately 2.5; use of a cerium-oxide containing low-iron glass superstrate reduced the rate of yellowing of A9918P EVA by approximately 75%. When laminates were prepared and exposed using 15295P EVA and cerium-oxide containing glass superstrate, there was no visible yellowing. Analytical results show no measurable loss of acetic acid from very browned, field-aged EVA and no evidence of conjugated unsaturation; analysis also reveals the loss of Cyasorb UV-531 in both field-aged and laboratory U.V. aged samples, but only in the presence of Lupersol 101. This result supports the finding of an interaction of Lupersol 101 with UV-531 as contributing to color formation in the presence of U.V.

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31 p./1.2 MB

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OSTI as DE95004093

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  • Other Information: PBD: Apr 1995

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  • Other: DE95004093
  • Report No.: NREL/TP--411-7693
  • Grant Number: AC36-83CH10093
  • DOI: 10.2172/64201 | External Link
  • Office of Scientific & Technical Information Report Number: 64201
  • Archival Resource Key: ark:/67531/metadc692757

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  • April 1, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • March 31, 2016, 6:58 p.m.

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Holley, W. Photovoltaic manufacturing technology (PVMaT). Semiannual subcontract report, March 31, 1994--September 30, 1994, report, April 1, 1995; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc692757/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.