Combined analysis of microstructures within an annual ring of Douglas fir (Pseudotsuga menziesii) by dynamic mechanical analysis and small angle X-ray scattering

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Results of fits to equatorial SAXS intensities from earlywood and latewood of Douglas fir swollen by water

Sample	Temperature (℃)	A (× 10³)^*1	2\(\overline{R }\) (nm)^*2	Δ\(\overline{R }\)/R ^*2	a (nm)^*2	Δa/a^*2	B (× 10³) ^*1	σ (× 10^–2)^*1	C (× 10^–3)^*1	α ^*³
Earlywood	25	0.20 ± 0.01	2.470 ± 0.004	0.24	3.50 ± 0.02	0.465 ± 0.001	0.155 ± 0.022	1.33 ± 0.03	0.012 ± 0.004	4.22 ± 0.06
	60	0.21 ± 0.01	2.485 ± 0.003	0.24	3.48 ± 0.02	0.466 ± 0.003	0.230 ± 0.033	1.31 ± 0.03	0.008 ± 0.001	4.32 ± 0.04
	90	0.22 ± 0.01	2.496 ± 0.014	0.24	3.47 ± 0.03	0.473 ± 0.005	0.201 ± 0.063	1.32 ± 0.01	0.017 ± 0.014	4.20 ± 0.16
Latewood	25	0.93 ± 0.03	2.572 ± 0.002	0.24	3.52 ± 0.00	0.432 ± 0.002	0.181 ± 0.012	1.78 ± 0.04	0.722 ± 0.038	3.43 ± 0.01
	60	0.99 ± 0.04	2.584 ± 0.003	0.24	3.51 ± 0.01	0.433 ± 0.001	0.268 ± 0.010	1.76 ± 0.02	0.460 ± 0.060	3.54 ± 0.03
	90	1.07 ± 0.04	2.603 ± 0.004	0.24	3.47 ± 0.01	0.444 ± 0.002	0.263 ± 0.062	1.85 ± 0.06	1.002 ± 0.546	3.41 ± 0.11

^*1Constants for each term of Eq. (1)
^*2Radius (\(\overline{R }\)) and distance (a) of hexagonally packed cylinders and their respective coefficients of variation
^*3Exponent of power-law at low q
See Eq. (1) for details