## 3 Results
### Mechanical Properties Test  
It was observed that all specimens bonded with D3 adhesive blends showed a good performance in dry conditions (see Figure 8). The shear strength values obtained from the dry test fluctuated between 9.8 and 12.51 MPa. In the same way, wood failure varied between 90 and 100%. This behavior was shown by pressed wood specimens at 60 min and 120 min, achieving the standard requirements. According to the dry test, the average (wood specimen group evaluated) as well as single values (each specimen tested) of shear strength and wood failure reached the standard requirement. For dry conditions, the wood specimens glued with D3-LIGNO 0.5% at 120 min of pressing time reached an average shear strength that was 100%, 28%, and 3% higher than the standard requirement, PVAc-D4 and neat PVAc-D3, respectively (see Figure 8a). On the other hand, wood specimens glued with D3-MWNTC 0.05% at the same pressing time reached an average shear strength that was 91%, 21% and 3% higher than the standard  
Figure 8: Shear strength test at dry condition. (**a**) Average shear strength and wood failure. (**b**) Loud vs. displacement at 120 min pressing time. Figure 7: DMA, three-point flexion method, wood–adhesive glue line bond stiffness (E\({}^{\prime}\)). requirement, PVAc-D4 and neat PVAc-D3, respectively. Always, at 120 min pressing time, wood specimens glued with D3-MWCNT 0.5%, D3-LIGNO 0.5% and D3-LIGNO 2.5%, achieved 100% wood failure under shear load. The load vs. displacement behavior of specimens glued with D3-MWCNT (0.05% and 0.5%) adhesive blends showed a balanced behavior between load resistance and ductility, followed by D3-LIGNO (0.5% and 2.5%), which confirms that this kind of reinforcing worked very well in dry conditions (see Figure 8b). ANOVA data analysis complemented with the [PERSON] (LSD) method of minimum significant difference indicated a statistically significant difference between the shear strength of specimens glued with D3-LIGNO 0.5% at 120 min pressing time and those glued with neat D3 and D4 adhesive for both pressing times (see Table 4), which indicates that ligno-sulfonate could be a very good alternative to reinforcing the D3 adhesive. The values of shear strength obtained from an elevated temperature test fluctuated between 2.16 and 7.83 MPa. Specimens glued with the neat D3 adhesive and D3-MWCNT (0.05% and 0.5%) adhesive blends, pressed at 60 min and 120 min, did not reach the standard average shear strength value, and neither did the individual one. Likewise, for the average and individual wood failure values, specimens glued with neat D3 and D3-MWCNT (0.05% and 0.5%) at 60 min and 120 min pressing times did not achieve standard requirements. Specimens glued with D3-LIGNO (0.5% and 2.5%) reached the highest values of average shear strength for the elevated temperature test with an even better result than D4 adhesive at 60 min of pressing time, achieving the standard request. Specifically, D3-LIGNO 0.5% reached an average shear strength of 89%, 40%, and 35% higher than a standard requirement, neat PVAc-D3 and PVAc-D4 adhesives, respectively. As shown in Table 4, the shear strength values of specimens glued with D3-LIGNO 0.5% and D3-MWCNT 0.5% at 60 min of pressing time presented statistically significant differences, confirming that D3-LIGNO blends, for this condition, have a better performance than D3-MWCNT blends. The average wood failure values were not very concordant with shear strength, varying between 0% and 50%. Specimens glued with D3-LIGNO blends showed quite good performance at shear strength in group (average) and individual ways. However, these specimens did not obtain the average and individual wood failure standard requirements. Finally, the average shear strength values obtained from the vacuum-pressure test of wood specimens fluctuated between 0.77 and 5.48 MPa, and average wood failure varied from 0% to 70%.