A study of degradation mechanisms in PVDF-based photovoltaic backsheets.

Autor: Uličná S; SLAC National Accelerator Laboratory, Menlo Park, CA, USA. Sona.Ulicna@nrel.gov., Owen-Bellini M; National Renewable Energy Laboratory, Golden, CO, USA., Moffitt SL; SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Sinha A; SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Tracy J; DuPont Specialty Products LLC, Wilmington, DE, USA., Roy-Choudhury K; DuPont Specialty Products LLC, Wilmington, DE, USA., Miller DC; National Renewable Energy Laboratory, Golden, CO, USA., Hacke P; National Renewable Energy Laboratory, Golden, CO, USA., Schelhas LT; National Renewable Energy Laboratory, Golden, CO, USA. Laura.Schelhas@nrel.gov.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Aug 24; Vol. 12 (1), pp. 14399. Date of Electronic Publication: 2022 Aug 24.
DOI: 10.1038/s41598-022-18477-1
Abstrakt: Commercial backsheets based on polyvinylidene fluoride (PVDF) can experience premature field failures in the form of outer layer cracking. This work seeks to provide a better understanding of the changes in material properties that lead to crack formation and find appropriate accelerated tests to replicate them. The PVDF-based backsheet outer layer can have a different structure and composition, and is often blended with a poly(methyl methacrylate) (PMMA) polymer. We observed depletion of PMMA upon aging with sequential (MAST) and combined (C-AST) accelerated stress testing. In field-aged samples from Arizona and India, where PVDF crystallizes in its predominant α-phase, the degree of crystallinity greatly increased. MAST and C-AST protocols were, to some extent, able to replicate the increase in crystallinity seen in PVDF after ~ 7 years in the field, but no single-stress test condition (UV, damp heat, thermal cycling) resulted in significant changes in the material properties. The MAST regimen used here was too extreme to produce realistic degradation, but the test was useful in discovering weaknesses of the particular PVDF-based outer layer structure studied. No excessive β-phase formation was observed after aging with any test condition; however, the presence of β-phase was identified locally by Fourier transform infrared spectroscopy (FTIR). We conclude that both MAST and C-AST are relevant tests for screening outdoor failure mechanisms in PVDF backsheets, as they were successful in producing material degradation that led to cracking.
(© 2022. The Author(s).)
Databáze: MEDLINE
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