The delamination of photovoltaic modules with supercritical CO₂ is an interesting approach to integrate photovoltaics into a circular economy. This article describes the first phase of this process: the absorption of CO₂ into poly(ethylene-co-vinyl acetate) (EVA-28), one of the layers in a photovoltaic module. The swelling of the polymer, determined by an on-line coupling between high pressure cell and an optical method using digital camera, under 60–200 bar at 60, 75 and 90 °C, was well reproduced by a modified Sanchez-Lacombe equation of state. The diffusion coefficient of CO₂ into EVA-28 was determined using the same approach and was found to range, at 130 bar, from 1.1 × 10⁻⁹ m²·s⁻¹ at 60 °C to 1.8 × 10⁻⁹ m²·s⁻¹ at 90 °C. A preferential CO₂ diffusion at the rear side of the cell, due to a high porosity, and at the “backsheet” interface was highlighted.

使用超临界 CO ₂对光伏模块进行分层是将光伏技术整合到循环经济中的一种有趣方法。本文介绍了该过程的第一阶段：将 CO ₂吸收到聚（乙烯-共-醋酸乙烯酯）（EVA-28）中，这是光伏模块中的一层。聚合物的溶胀，由高压电池和使用数码相机的光学方法之间的在线耦合确定，在 60-200 bar、60、75 和 90 °C 下，通过改进的 Sanchez-Lacombe 方程很好地再现了状态。CO ₂进入 EVA-28的扩散系数使用相同的方法确定，发现在 130 bar 下的范围为 1.1 × 10 ^-9 m ² ·s ^-1在 60 °C 到 1.8 × 10 ^-9 m ² ·s ^-1在 90 °C。由于高孔隙率，电池背面和“背板”界面的CO ₂优先扩散被突出显示。