Fig. 5. IR spectra of the rods prepared with Pluronic P-123 in the range of (a) 900–1500 cm⁻¹ and (b) 2750–3100 cm⁻¹, and with Pluronic F-108 in the range of (c) 900–1500 cm⁻¹ and (d) 2750–3100 cm⁻¹.