Fig. 4: Reconstruction of polyurethane foams (PUF).
From: Atom economic closed-loop recycling of thermoset polyurethane foams
a The photographs of the original PUF, the acetoxime/particle mixture after deconstruction, and the regenerated PUFs. b Comparison of the SEM images of the original and regenerated PUF. c Porosity of the regenerated PUFs corresponding to different deconstruction times. Data are presented as mean values ± standard error of the mean (s.e.m.). Centre values denote average. Error bars denote s.e.m. n = 5 for the samples. d Compressive stress-strain curves of the original and regenerated PUFs corresponding to different deconstruction times, with the insets showing the zoom-in of the small strain range. e The first, tenth, and thirtieth cyclic compressive stress-strain curves of the regenerated PUF. f Compressive stress-strain curves of the first, second, and third regenerated PUFs. g Comparative characterization results from life cycle assessment.
