Skip to main content
. 2020 Oct 15;12(10):2372. doi: 10.3390/polym12102372

Figure 1.

Figure 1

Structure of PCL–PEG–PCL triblock copolymers prepared by ring-opening polymerization of Ɛ-caprolactone by poly(ethylene glycol) diol with stannous octoate catalyst. (a) FT-IR spectrum of entry X showing characteristic ester stretch at 1721 cm−1; (b) 1H NMR spectrum of entry X with peak assignments.