Fig. 4 | Polymer Journal

Fig. 4

From: Cationic ring-opening copolymerization of a cyclic acetal and γ-butyrolactone: monomer sequence transformation and polymerization–depolymerization control by vacuuming or temperature changes

Fig. 4

(A) MWD curves and (B) 1H NMR spectra (in CDCl3 at 30 °C) of the poly(MDOP-co-γBL)s. Polymerization conditions (the same conditions as those for entry 4 in Table 1 except for temperature change): [HBVE (MDOP)]0 = 2.5 M, [γBL]0 = 2.0 M, [PhSO3H]0 = 4.0 mM, in toluene at (i) 30 → (ii) 60 → (iii) 90 → (iv) 30 °C). (C) 1H NMR spectra (in CDCl3 at 30 °C) of the quenched reaction solutions. See Scheme S1 for other possible structures

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