Fig. 4. Degradation of PDMDL (M_n = 39 000, Đ = 1.42, 4.0 wt%, 1 equiv. of the DMLD unit) using pentylamine (4.0 wt%, 1.5 equiv.) in CD₃CN (92.0 wt%) at 65 °C. (a) GPC chromatograms and (b) plot of M_nvs. degradation time. The 0 h sample in (a) is a sample right after the addition of pentylamine. (c) ¹H NMR and (d) ¹³C NMR spectra of the reaction mixture after degradation for 60 h (400 MHz for ¹H NMR (100 MHz for ¹³C NMR) in CD₃CN).