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. 2021 Jan 26;13(3):382. doi: 10.3390/polym13030382

Figure 1.

Figure 1

Chemical properties of poly(glycerol sebacate) (PGS) substrates. Fourier transform infrared spectroscopy (FTIR) spectra (transmittance) of PGS substrates obtained at different cured temperatures (130 °C, 150 °C and 170 °C) and glass cover slides. (a) Detailed FTIR spectra at the PGS characteristic chemical peak wavelengths: 1600–1800 cm-1 for COO− peak on the right and 4000–2500 cm−1 for free –OH groups and -CH2 bonding on the left. (b) –OH/COO− ratio obtained from transmittances at 3350 cm−1 and 2927 cm−1.