Table 1. Results of Copolymerization^a.

sample	MA/THPA oligomer feedb	polymer yieldc	gel (%)	Mnd	Mw/Mne	selectivity for polymerf	carbonate linkagesg
PPC	0	25	0	70	3.0	96	98
PPC0.5	0.5	55	16 ± 1.3	91	4.5	98	97
PPC1	1	60	23 ± 1.5	82	4.7	98	97
PPC2	2	66	29 ± 1.7	68	4.4	98	97
PPC3	3	70	37 ± 2.2	58	4.6	99	97
PPC4	4	74	42 ± 2.5	58	4.8	99	97

^aPolymerization conditions: zinc glutarate (ZnGA, 0.15 g), propylene oxide (PO, 45 mL), CO₂ pressure 5.0 MPa, 70 °C, 30 h.

^b(Maleic anhydride/cis-1,2,3,6-tetrahydrophthalic anhydride) (MA/THPA) oligomer feed of PO in the copolymerization (wt %).

^cg Polymer/g ZnGA.

^dM_n = Number average molecular weight (Kg·mol^–1), determined by GPC.

^eMolecular weight distribution: M_w = weight average molecular weight (Kg·mol^–1).

^fSelectivity for polymer over cyclic carbonate in % units, which was determined by the ¹H NMR spectroscopy of the reaction mixture after copolymerization.

^gCarbonate linkages over ether linkages in % units, which were determined by the ¹H NMR spectroscopy of the soluble fraction of polymers after purification. The M_n, polymer selectivity and carbonate linkages do not include the gel, because the gel is insoluble.