Scheme 1. Preparation process of DMF based polyurethanes.
Figure 1. Viscosity of PUs.
Figure 2. FT-IR spectra of PUs.
Figure 3. DSC thermograms of PU films.
Figure 4. Storage modulus (a), loss modulus (b), and tan delta (c) of PU films.
Figure 5. TGA (a) and DTG (b) curves of PU films.
Figure 6. Stress-strain curves of PU films.
Figure 7. SEM micrographs of wet-type artificial leather based on nonwoven fabrics coated with DMF based polyurethane.
Table 1. Macroglycols used in this study
Table 2. Sample designation and composition of polyurethanes containing bio polyol
Table 3. Thermal and mechanical properties of polyurethanes films
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