Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control

Figure 3

¹HNMR spectrum of PCHO. Polymerization catalyzed by 0.2 g of H₃PW₁₂O₄₀·13H₂O at 40°C during 3 hours in CH₂Cl₂.