TGA results: decomposition temperatures for kraft lignin (KL) isolated at pH 4 and corresponding lignin-derived polyurethanes (LPU) prepared with and without TEA, respectively.

Sample	T 5% [°C]	T 10% [°C]	T 50% [°C]	R 700 [%]
KL/isolated at pH 4	133	223	579	44
LPU/with TEA	190	226	360	29
LPU/without-TEA	170	218	356	32