Synthesis and Characterization of Biodegradable Polyurethane for Hypopharyngeal Tissue Engineering

Figure 1

FTIR spectra of HDI (a), PEG (b), L-LA (c), PLEG 4 (d), and cPU (e). The resolution is 4 cm⁻¹ and the measuring period is 500–4000 cm⁻¹.