Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (1/1 displayed)

  • 2022A study of degradation mechanisms in PVDF-based photovoltaic backsheets28citations

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Chart of shared publication
Schelhas, Laura T.
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Miller, David C.
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Roy-Choudhury, Kaushik
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Hacke, Peter
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Tracy, Jared
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Sinha, Archana
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Owen-Bellini, Michael
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Uličná, Soňa
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2022

Co-Authors (by relevance)

  • Schelhas, Laura T.
  • Miller, David C.
  • Roy-Choudhury, Kaushik
  • Hacke, Peter
  • Tracy, Jared
  • Sinha, Archana
  • Owen-Bellini, Michael
  • Uličná, Soňa
OrganizationsLocationPeople

article

A study of degradation mechanisms in PVDF-based photovoltaic backsheets

  • Schelhas, Laura T.
  • Miller, David C.
  • Roy-Choudhury, Kaushik
  • Moffitt, Stephanie L.
  • Hacke, Peter
  • Tracy, Jared
  • Sinha, Archana
  • Owen-Bellini, Michael
  • Uličná, Soňa
Abstract

<jats:title>Abstract</jats:title><jats:p>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.</jats:p>

Topics
  • impedance spectroscopy
  • polymer
  • phase
  • crack
  • aging
  • Fourier transform infrared spectroscopy
  • crystallinity
  • aging