Table 4.

Values of storage modulus G’ and glass transition temperature Tg for composites based on lignin–silica hybrids and pure lignin.

Sample	G’ 25 °C (GPa)	G’ 50 °C (GPa)	G’ 300 °C (GPa)	tan δmax	Tg (°C)
Lignin–SiO2 (8:1, wt./wt.)	1.80	1.74	0.82	0.0654	252
Lignin–SiO2 (8:2, wt./wt.)	2.21	2.16	0.88	0.0718	250
Lignin–SiO2 (8:4, wt./wt.)	1.43	1.39	0.52	0.0708	220
Lignin–SiO2 (8:6, wt./wt.)	1.66	1.62	0.73	0.0748	230
Lignin	2.00	1.95	0.88	0.0859	206