## 5 Conclusions  
The chemical effect of the reinforcing agent drastically influences the viscosity of the adhesive blends, which depends on its nature and its solubility. A filler's lack of solubility can affect the adhesive blend quality, cohesion properties, and glue line mechanical properties. The FTIR analysis indicates that the D3-MWCNT 0.5% adhesive blend showed a small intensity increase at 1734 cm\({}^{-1}\) transmittance because of the presence of MWCNT particles. Also, the PVAc-D4 adhesive evidenced a marked intensity on the fingerprint zone, indicating a higher cross-linked degree than other adhesive samples. DMA analysis indicated that LIGO and MWCNT fillers help to increase the E\({}^{\prime}\) value at the wood-PVAc adhesive bond line, working better than neat PVAc-D3, showing that both reinforcements significantly improve their performance. The dry condition wood specimens glued with D3-LIGNO 0.5% at 120 min of pressing time reached a higher average shear strength than the standard requirement, PVAc-D4 and neat PVAc-D3 adhesives. However, this improvement was quite significant, according to the standard requirement and D4 adhesive performance, but it was not very relevant, concerning the D3 adhesive behavior. Specimens glued with D3-MWCNT (0.05% and 0.5%) adhesive blends showed a balanced behavior between load resistance and ductility in dry conditions. Also, specimens glued with D3-LIGNO 0.5%, at 60 min of pressing time, under elevated temperature conditions achieved an average shear strength higher than the standard requirement, neat PVAc-D3 and PVAc-D4 adhesives. LIGNO and MWCNT particles improved the PVAc-D3 adhesive performance in dry conditions. At high temperatures, the LIGNO filler worked very well as a thermic stabilizer, being a promising alternative as a PVAc adhesive-reinforcing agent. For future works, we will consider tests using functionalized MWCNTs, which could improve significantly these filler performances at elevated temperatures and vacuum-pressure conditions, into a water-soluble polymeric matrix, such as PVAc leading to a water-soluble polymeric matrix, as seen with PVAc. The D4 adhesive presented the best performance at the delamination test, which was followed by neat D3 at 60 min pressing time, D3-MWCNT (0.05% and 0.5%) at 120 min and 60 min pressing time, respectively, as well as D3-LIGNO 0.5% at 60 min pressing time and the D4 adhesive at 60 min and 120 min pressing time. In general, for the delamination cycle, the wood specimens glued with PVAc-D3 MWCNT blends for both pressing times showed better performance than those glued with PVAc-D3 LIGNO blends at humid conditions. The average penetration (AP) at 60 min and 120 min pressing times suggests that the optimal adhesive depth range is 70-77 \(\upmu\)m and 93-98 \(\upmu\)m, respectively, to procure a good-quality bond between the adhesive and substrate with delamination \(\leq\)5%. The wood elastic recovery or \"shape memory effect\", produced by a long pressing time, can affect negatively the glue line strength, because a more extensive pressing time may imply a higher release of elastic recovery potency in the presence of humidity, causing a weak interphase and an adhesive bond with poor mechanical properties. Conceptualization, M.V.-V. and M.N.-D.; methodology, M.V.-V., M.N.-D. and B.M.-R.; software, M.V.-V., M.N.-D. and C.O.-C.; validation, M.V.-V., M.N.-D., B.M.-R. and C.O.-C.; formal analysis, M.V.-V., M.N.-D., J.H.-D., P.C.-M. and C.J.-B. ; investigation, M.V.-V., M.N.-D., J.H.-D., P.C.-M. and C.J.-B. ; resources, M.V.-V. and M.N.-D.; data curation, M.V.-V., M.N. [PERSON], [PERSON], [PERSON] and [PERSON]; writing--original draft preparation, M.V.-V.; writing--review and editing, [PERSON]-V. and [PERSON]; visualization, M.V.-V. and [PERSON]; supervision, M.V.-V.; project administration, M.V.-V.; funding acquisition, M.V.-V. All authors have read and agreed to the published version of the manuscript. APC was funded by Centro Nacional de Excelencia para la Industria de la Madera (CENA-MAD), Chile. Not applicable.