Encapsulant Thermal Accelerated Aging (90 Celsius, no UV) Experimental Data - Metadata

EVA, POE, and EPE encapsulant samples (from a commercial source) were subjected to different durations of thermal accelerated aging. The lengths of aging are: (unaged, 2 weeks, 4 weeks, 8 weeks, 14 weeks, 20 weeks, 30 weeks). The aging conditions are as follows: - Condition A: 90 Celsius, open-air, no UV - Condition B: 90 Celsius, sealed in glovebox air, no UV - Condition C: 65 Celsius, sealed in glovebox air, no UV

The following characterization techniques were performed on the encapsulants at different lengths of aging: - Soxhlet extraction to measure the encapsulants' degree of crosslinking (gel content) - Differential scanning calorimetry (DSC) to measure the encapsulants' degree of crystallinity. - Fourier Transformed Infrared Spectroscopy - Attenuated Total Reflectance (FTIR-ATR) to measure changes in moieties of chemical bonds of the encapsulants. - Dynamic mechanical analysis (DMA) to measure changes in the storage and loss moduli of encapsulants over aging time.

Note: Opening the raw DSC data files requires the TRIOS software, which is free and available from TA Instruments (https://www.tainstruments.com/support/software-downloads-support/downloads/)

Soxhlet extraction details: - Solvent: Mixed xylenes - Time of extraction: 10 to 12 hours (aim for 180 to 200 Soxhlet extraction cycles) - Sample: EVA or POE or EPE encapsulants - Value computed: Gel content, which is the degree of crosslinking of the encapsulants.

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