Table 1.

Characterization of the polymers.

Polymers	Mn a)	Mw b)	PDI b)	Tg (°C)
PC-S c)	2490	3680	1.48	27.7
PUR-PC	5460	8270	1.52	53.3
PC-S’	3153	3996	1.267	38.6
PUR-PC’	8234	14532	1.765	55.2
PUR	24380	57680	2.37	44.7

^a)Calculated by SEC results;

^b)The polydispersity index, PDI = Mw/Mn;

^c)The soft segment of PUR-PC, LLA/PC molar ratio in feed was 33/1.