Synthesis of Block Copolymers of Varying Architecture Through Suppression of Transesterification during Coordinated Anionic Ring Opening Polymerization

Table 3

NMR data of the structural analysis of triblock copolymers.

N	Molar ratio α-methyl styrene : Sn(Oct)2	Ratio L-lactide/ε-caprolactone (% mol by ^1H NMR)	PCL segment length, monomer units	PLA segment length, monomer units
1	2.5	42.7/57.3	21.3	25.2
2	25	41.8/58.2	26.5	24.2
3	125	42.2/57.8	5.7	12.1
4	250	45.3/54.7	40.2	42.3
5	2500	49.8/50.2	26.6	39.0
6	No protector	41.8/58.2	5.8	7.8