Quantitative Evaluation of the Yellowing and the Resulting Sound Absorption Performance of Polyurethane Foam by Fourier-Transform Infrared Spectroscopy (FT-IR) Spectroscopy
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We aim to quantitatively assess the degree of yellowing in polyurethane foam (PUF), a crucial material for sound absorption in the automotive industry. FT-IR spectra were obtained for each sample, revealing significant spectral differences between more yellowed and less yellowed PUF samples. Specifically, the intensity ratio “I (asymmetric CH2 at 2900 cm-1)/I (symmetric CH2 at 2850 cm-1)” was investigated to quantitatively differentiate the degree of yellowing in each PUF sample. A higher I (asymmetric CH2 at 2900 cm-1)/I (symmetric CH2 at 2850 cm-1) indicates a greater degree of yellowing in PUF. This can be attributed to the asymmetric CH2 bonds in PUF, which act as chromophores. Their structural asymmetry creates conditions that favor strong absorption of light, resulting in visible discoloration, such as yellowing or other chromophoric behaviors.