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

Table 2

Characteristics of triblock copolymers synthesised in the presence of α-methylstyrene.

N	Molar ratio α-methyl styrene : Sn(Oct)2	Mn (SEC), Da, (Mn/Mw)	Crystallinity (%) and (melting temperature (^°C))
			PCL	PLA
1	2.5	63,231 (1.41)	32.5 (57.9)	52.7 (164.6)
2	25	75,981 (1.58)	28.1 (51.9)	39.1 (164.0)
3	125	66,751 (1.50)	0	28.0 (142.0)
4	250	53,175 (1.51)	43.8 (52.4)	52.6 (165.3)
5^*	2500	39,584 (1.54)	14.6 (43.2)	39.7 (159.2)
6	No protector	26,583 (1.72)	—	—

^∗Reaction performed without solvent.