The effect of phenyl content on the degradation of poly(dimethyl diphenyl) siloxane copolymers

Deshpande, Girish; Rezac, Mary E.

doi:10.1016/s0141-3910(01)00186-0

Cited by 91 publications

(67 citation statements)

References 18 publications

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“…PPMS is particularly well matched to borosilicate and soda lime glass. The use of PPMS as an encapsulant, however, is not recommended because the aromatic phenyl ring structure is known to yellow in response to UV photo-excitation [10]. Separately, PMMA, EVA, PVB and ionomer all demonstrate very similar n. The use of a fluid to fill the module cavity, thereby reducing the reflectance losses of the internal components, is not considered in this study.…”

Section: Measurement Of Candidate Components and Materialsmentioning

confidence: 99%

Analysis of transmitted optical spectrum enabling accelerated testing of CPV designs

et al. 2009

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Concentrated photovoltaics (CPV) has recently gained interest based on its scalability and expected low levelized cost of electricity. The reliability of materials used in CPV systems, however, is not well established. The current qualification test for photodegradation of CPV modules includes only real-time ultraviolet (UV) exposure, i.e. methods for accelerated UV testing have not been developed. Therefore, the UV and infrared (IR) spectra transmitted through representative optical systems is evaluated in this paper. The measurements of concentrating optics are used to assess expected optical performance as well as to understand how to quantify damaging optical exposure. Optical properties (transmittance, refractive index, reflectance, and absorptance) of candidate materials are identified. The dose and flux analysis here identifies the increased significance of IR (as opposed to UV) exposure for CPV systems, particularly for the most concentrating systems. For these, the UV dose may not greatly exceed the unconcentrated global solar condition, but the thermal load scales nearly directly with the geometric concentration.

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Section: Measurement Of Candidate Components and Materialsmentioning

confidence: 99%

Analysis of transmitted optical spectrum enabling accelerated testing of CPV designs

et al. 2009

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“…Silicone has high heat resistance [16,17]. Silicone-based flame retardants are noted to generate less amounts of toxic substances even in case of fire, and are increasing used for improving polymers' flame retardancy, especially for polycarbonate.…”

Section: Introductionmentioning

confidence: 99%

The thermal degradation of bisphenol

Zhou

Yang

Zhou

2007

Journal of Analytical and Applied Pyrolysis

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“…The use of PPMS as an encapsulant, however, is not recommended because the aromatic phenyl ring structure is known to yellow in response to UV photoexcitation. [33][34][35] Separately, PMMA, EVA,PVB, TPU and ionomer all demonstrate very similar n. While generally similar in magnitude to the other hydrocarbon materials, PO does not vary as substantially with wavelength. The use of a fluid to fill the module cavity, thereby reducing the reflectance losses of the internal components, is not considered in this study.…”

Section: The Refractive Index Of Transmitting Opticsmentioning

confidence: 95%

Analysis of transmitted optical spectrum enabling accelerated testing of multijunction concentrating photovoltaic designs

et al. 2011

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Concentrating photovoltaic (CPV) technology has recently gained interest based on its scalability and expected low levelized cost of electricity. The reliability of encapsulation materials used in CPV systems, however, is not well established. For example, the present qualification test for CPV modules includes only real-time ultraviolet (UV) exposure, i.e., methods for accelerated UV testing have not yet been developed. To better define the stress inherent to CPV systems, the UV and infrared spectra transmitted through representative optical systems were evaluated. Measurements of optical components are used to assess expected optical performance and quantify damaging optical exposure. Optical properties (transmittance, refractive index, reflectance, and absorptance) of candidate materials (including PMMA, soda-lime glass, borosilicate glass, and quartz refractors), components (including Ag-and Al-enabled reflectors), and encapsulants (including EVA, ionomer, PDMS, PPMS, polyolefin, and PVB) were identified. The activation spectrum was calculated for the representative optical systems using an assumed action spectrum to compare the expected damaging dose of UV radiation delivered to the cell encapsulation. The dose and flux analysis identifies the significance of IR relative to UV exposure for CPV systems. Because UV light is typically more highly attenuated, the UV dose within the encapsulation may not greatly exceed the unconcentrated global solar condition, but the thermal load scales nearly directly with the geometric concentration. Relative to a previous analysis for crystalline silicon cell technology, the analysis here is performed for III-V multijunction technology. Novel aspects here also include additional materials (such as TPU encapsulation) and additional components (transmission through silicone on glass lenses, antireflective coatings, and the front glass used with reflective systems, as well as reflection off of the cell). C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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The effect of phenyl content on the degradation of poly(dimethyl diphenyl) siloxane copolymers

Cited by 91 publications

References 18 publications

Analysis of transmitted optical spectrum enabling accelerated testing of CPV designs

Analysis of transmitted optical spectrum enabling accelerated testing of CPV designs

The thermal degradation of bisphenol

Analysis of transmitted optical spectrum enabling accelerated testing of multijunction concentrating photovoltaic designs

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