Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 2 Surface tension components of untreated wood and compregs from geometric mean model and acid–base model

From: Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

Density (g/cm³)	Surface free energy (mJ/m²)
	Geometric mean model			Acid–base model
	γ ^d_S	γ ^p_S	γ ^T_S	γ ^LW_S	γ ⁺_S	γ ⁻_S	γ ^AB_S	γ ^T_S
Untreated^a	35.56	0.34	35.90	35.56	4.33	1.59	5.24	40.80
0.60	29.54	0.01	29.55	29.54	0.65	0.46	1.10	30.64
0.71	28.69	0.30	28.99	28.69	0.80	0.01	0.21	28.90
0.80	27.82	0.86	28.68	27.82	0.95	0.11	0.65	28.47
0.90	25.39	1.45	26.84	25.39	1.52	0.22	1.16	26.55
1.01	25.35	1.71	27.06	25.35	2.36	0.10	0.97	26.32
1.10	24.21	2.27	26.48	24.21	2.96	0.17	1.42	25.63
1.20	23.71	2.56	26.27	23.71	3.44	0.17	1.53	25.24

^aThe density of the untreated sample is 0.39 g/cm³

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