Lignosulfonate/APP IFR and its flame retardancy in lignosulfonate-based rigid polyurethane foams

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Detailed data of TGA measurements of RPU and LRPU foams

Sample	Lignin contents (%)	T _max1 ^a (°C)	Mass loss1^a (wt%)	T _max2 ^a (°C)	Mass loss2^a (wt%)	Char_700 °C ^a (wt%)
RPU	0	139	4.4	288	57.0	30.0
L₅RPU	5	144	1.4	294	58.4	32.5
L₁₀RPU	10	155	1.7	296	58.8	32.7
L₁₅RPU	15	155	1.6	304	32.7	33.4
L₂₀RPU	20	157	2.2	305	56.8	33.3
L₂₅RPU	25	155	2.0	307	55.7	34.0
L₃₀RPU	30	157	2.1	307	54.5	32.9

TGA, RPU, and LRPU refer to thermogravimetric analysis, rigid polyurethane, and lignosulfonate-based rigid polyurethane, respectively
^aT_max1 and T_max2 refer to the maximum degradation temperature at the first degradation step and the second degradation step, respectively. Mass loss1 and Mass loss2 refer to the mass loss at the first step and second step, respectively. The char was obtained at 700 °C from TGA curves