Table 2. Ring-opening polymerization of 2,3-DHB using PPDL as a macroinitiator and TBD as catalyst at different reaction conditions.^a .

Mn,PPDL b / g mol-1	PDIb	nPPDL c / mmol	n2,3-DHB / mmol	c2,3-DHB / mg mL-1	Mcalc. d / g mol-1	conv.e / %	Mn b / g mol-1	PDIb	mol%e PPDL	mol%e P2HEB	mass%f PPDL	mass%f P2HEB
2,200	1.88	0.023	3.05	714	22,000	40	9,800	1.28	18	82	24	76
8,900	2.12	0.006	3.05	625	80,000	17	16,000	1.65	33	67	42	58

^aReactions were performed for three days at 40°C in chloroform.

^bNumber-average molecular mass M_n and PDI were determined by GPC in chloroform using PMMA standards.

^cThe same molar amount was used for the catalyst.

^dCalculated molecular mass based on the ratio of the reactants.

^eConversion (relative to 2,3-DHB) and molar ratio was determined by ¹H NMR spectroscopy.

^fCalculated from the molar percentage and molecular mass M of the repeat units (M(PDL) = 240.38 g mol^-1; M(2,3-DHB) = 164.16 g mol^-1).