Preparation of Higher Molecular Weight Poly (L-lactic Acid) by Chain Extension

Table 2

DSC data of the PLA prepolymer and the chain-extended PLA.

Run	𝑀^𝑐𝑤 (×10^−4 g/mol)	Insoluble content (wt%)	𝑇𝑔(°C)	𝑇𝑚 (°C)	Δ𝐻𝑚 (J/g)	𝑋𝑐 (%)
Prepolymer	2.0	0	59.0	170.3	52.9	56.8
1	16.3	2.2	57.2	161.1	39.6	42.5
2	12.1	3.0	57.2	164.5	41.1	44.1
3	20.3	3.6	56.6	163.5	39.4	42.3
6	9.6	4.4	55.5	158.8	42.2	45.3
8	10.7	3.6	56.2	163.5	43.8	47.1
9	12.5	3.8	55.8	164.1	43.5	46.7
10	12.6	4.1	56.2	164.5	42.9	46.1