Synergistic Effect of Nanosilica Aerogel with Phosphorus Flame Retardants on Improving Flame Retardancy and Leaching Resistance of Wood

Table 2

Mass variety of different stage for untreated and treated poplar wood.

Samples	𝑊0^a (g)	𝑊1^a (g)	𝑊2^a (g)	WPG^b (%)	RL^c (%)	ERL^d (%)	RSFR^e (%)	LRV^f (%)
S0	2.8811	2.8811	2.8673	0		0.48
S1	3.3466	3.795	3.4283	13.40	9.66		4.22	31.46
S2	3.2395	3.6746	3.2906	13.43	10.45		2.98	22.19
S3	3.3678	3.8283	3.4149	13.67	10.80		2.88	21.03
S4	3.2961	3.9796	3.6510	20.73	8.26		12.48	60.18
S5	3.4955	4.1337	3.8157	18.26	7.69		10.56	57.87
S6	3.1912	3.7708	3.4628	18.16	8.17		9.99	55.03

^a𝑊₀: weight of untreated wood. 𝑊₁: weight of treated wood after impregnation experiment. 𝑊₂: weight of treated wood after leaching test. ^bWPG (weight percent gain) = (𝑊−𝑊₀)/𝑊₀. ^cRL (average turnover rate) = (𝑊₁−𝑊₂)/𝑊₁. ^dERL was the average turnover rate of untreated wood. ^eRSFR (rest loading efficiency) = WPG − RL + ERL. ^fLRV (leaching resistance value) = RSFR/WPG.