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Degradation mechanism of silicone glues under UV irradiation and options for designing materials with increased stability

The degradation of silicone glues used, for example, in the assembly of solar modules for use in space, has been investigated and possible mechanisms which lead to colouration and possible embrittlement are analysed. Both effects are connected to the generation of radicals upon exposure to UV irradi... Full description

Contained in: Polymer Degradation and Stability Vol. 98, No. 3 (2013), p. 720-726
Fulltext access:
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Links: Additional Link (dx.doi.org)
Additional Keywords: ATMOSPHAERISCHE-ULTRAVIOLETTBESTRAHLUNG
BEWEGLICHKEIT
METALL-CLUSTER
NANOPARTIKEL
SILICON:POLYMER
ULTRAVIOLETTBESTRAHLUNG
VAKUUM
VERSPROEDUNG
DOI: 10.1016/j.polymdegradstab.2012.12.022
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 7 Seiten, 12 Bilder, 1 Tabelle, 25 Quellen
ID (e.g. DOI, URN): 10.1016/j.polymdegradstab.2012.12.022
PPN (Catalogue-ID): WTI053529278
Note: WTI TEMA DB
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520 |a The degradation of silicone glues used, for example, in the assembly of solar modules for use in space, has been investigated and possible mechanisms which lead to colouration and possible embrittlement are analysed. Both effects are connected to the generation of radicals upon exposure to UV irradiation. As a follow up-reaction in vacuum, cross-linking and subsequently embrittlement and cracking due to shrinkage can occur. The degradation of the polymers via a radical mechanism can also lead to the formation of small metal clusters containing residues of the Karstedt catalyst and also silicon. Both types of nanoparticles contribute to colouration of the silicone glues. Possible ways to avoid this is the use of ultra-pure starting substances, a minimum amount of catalyst and a higher cross-link density of the silicone, minimizing the mobility of dangling chains formed upon UV-exposure and their tendency to form metal clusters. [Copyright Elsevier B.V. Reproduced with permission.] 
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