Photothermal Degradation of Ethylene/Vinylacetate Copolymer

Liang, Ranty H.; Chung, Seok; Clayton, A.B.; Stefano, S. Di; Oda, Kōhei; Hong, Sungwook; Gupta, Amitava

doi:10.1007/978-1-4684-4358-5_17

Cited by 5 publications

(8 citation statements)

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“…Coupling between temperature and photodegradation is identified for EVA in Ref. , warranting further examination. Coupling between temperature and photooxidation for EVA is implied, but not specifically quantified, in Refs.…”

Section: Introductionmentioning

confidence: 90%

“…(In one prominent incident , however, the effect of reduced transmittance was much less significant than that related to damaged electrical connectivity at solder joints). Molecular cross‐linking (gel content) is increased as the result of artificial or field UV exposure , with a corresponding effect on the mechanical properties (decreased elastic modulus and reduced tensile strength ). Reference (where gel content was identified as steady) refutes these usual observations.…”

Section: Introductionmentioning

confidence: 99%

“…Reference (where gel content was identified as steady) refutes these usual observations. Acetic acid may form in EVA as a by‐product of degradation and act as a catalyst for further degradation . Metal/EVA interfaces were also speculated to catalyze the degradation of EVA, including interfaces with Ag, Cu, Sn, and Pb (common interconnect and solder materials) .…”

Section: Introductionmentioning

confidence: 99%

“…The first weight loss peak for EVA (occurring from 280°C to 400°C in TGA) corresponds to the process of deacetylation, where the acetate groups are lost from the polymer backbone. Deacetylation may occur at lower temperature (e.g., 150°C , 130°C , 120°C , or 105°C ) in the steady state. Deacetylation is identified as a first‐order reaction, with rate constants (activation energy and frequency factor) given in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…; indoor studies include Refs. . References make use of light exceeding the nominal terrestrial irradiance.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Durability of polymeric encapsulation materials for concentrating photovoltaic systems

Miller

Muller

Kempe

et al. 2012

Progress in Photovoltaics

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The durability of polymeric encapsulation materials was examined using outdoor exposure at the nominal optical concentration of 500 suns. The results for 12 months' cumulative field deployment are presented for materials including ethylene‐co‐vinyl acetate, polyvinyl butyral (PVB), ionomer, polyethylene/polyoctene copolymer, thermoplastic polyurethane, poly(dimethylsiloxane), and poly(phenyl‐methyl siloxane). Measurements during the experiment included optical transmittance (direct and hemispherical), mass, visual appearance, and fluorescence spectroscopy in addition to the initial thermogravimetry of the materials. Measurements of the field conditions and ultraviolet dose at the test site were facilitated by numerous laboratory instruments; characterization of the specimen temperature was performed using thermography. Discovery experiments identified the importance of a secondary homogenizer optic and the importance of contamination control. To date, the formal experiment verified a thermal‐runaway‐motivated combustion failure mechanism for one of the PVB formulations and identified densification, cracking, and haze‐formation behaviors in some of the silicone specimens. The behaviors observed for the silicone specimens may be facilitated by their greater thickness. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…; indoor studies include Refs. . References make use of light exceeding the nominal terrestrial irradiance.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Durability of polymeric encapsulation materials for concentrating photovoltaic systems

Miller

Muller

Kempe

et al. 2012

Progress in Photovoltaics

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A multifield coupled thermo‐chemo‐mechanical theory for the reaction‐diffusion modeling in photovoltaics

Liu

Lenarda

Reinoso

et al. 2023

Numerical Meth Engineering

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A comprehensive coupled thermo-chemo-mechanical modeling framework is proposed in this work to study the reaction-diffusion phenomena taking place inside photovoltaics (PV). When exposed to hygrothermal conditions, the encapsulant ethylene-co-vinyl acetate (EVA) layers undergo chemical degradation that significantly influences the overall PV performance. Aiming at efficient thermo-mechanical modeling, the coupled displacement-temperature governing equations for the EVA layers are formulated, and its 3D finite element (FE) implementation is derived in detail. Subsequently, the chemical reaction-diffusion processes occurring in the EVA layers are described, and the corresponding numerical implementation is formulated with the consideration of spatial and temporal variation of diffusivity and chemical kinetic rates. Specifically, the thermo-mechanical solution accounting for the heat generation from chemical reactions is projected to the FE model of the reaction-diffusion system in order to determine the kinetic rates and diffusion coefficients for its subsequent analysis. The proposed modeling method is applied to simulate the evolution of reaction-diffusion species at different damp heat tests, and predictions show a very satisfactory agreement with the analytical solution and experimental electroluminescence images taken from the literature. Its capabilities to predict the spatio-temporal variation are demonstrated through the simulation of the humidity freeze test, where the cyclic temperature boundary condition is imposed. With this modeling framework, it is possible to evaluate the degradation of PV modules under varying environmental boundary conditions, thus providing a guideline to design new products tailored for specific climatic zones.

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A reaction-diffusion formulation to simulate EVA polymer degradation in environmental and accelerated ageing conditions

Gagliardi

Lenarda

Paggi

2017

Solar Energy Materials and Solar Cells

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Photothermal Degradation of Ethylene/Vinylacetate Copolymer

Cited by 5 publications

References 0 publications

Durability of polymeric encapsulation materials for concentrating photovoltaic systems

Durability of polymeric encapsulation materials for concentrating photovoltaic systems

A multifield coupled thermo‐chemo‐mechanical theory for the reaction‐diffusion modeling in photovoltaics

A reaction-diffusion formulation to simulate EVA polymer degradation in environmental and accelerated ageing conditions

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