## 4 Conclusions  
1. From the development of IFR bioadditive formulations and their physicochemical and electrical evaluation, dynamic mechanical analysis (DMA), shear strength, and fire resistance, it was established that both formulations F1 and F2 were able to modify the commercial PVAc adhesive, although the thermal evaluation (TGA and DSC) of both samples showed that the formulation F2 was the most thermally stable since this formulation contains the highest concentration of Mg(OH)2. 2. From the modified PVAc adhesive blends, the 2.5% F1 and 5% F2 PVAc-bioadditive IFR adhesive blends have been selected, based on the evaluation of mechanical properties. According to the standard requirement, the results of shear test of the elevated temperature condition were 7 MPa and 8 MPa of shear strength, respectively. Additionally, the wood failure results were 50% and 75%, respectively, with the highest deep penetration of the adhesive over the substrate. In addition, according to the delamination standard requirement, the results were 3% and 5%, respectively. On the other hand, according to an intumescent flame-retardant application, the sample 12.5% F2 PVAc-bioadditive IFR adhesive blend had been selected (fire test: 6.10% of mass loss and 3.89% of carbonization index). It can be concluded that it is possible to develop a bioadditive capable of improving the thermal properties of a PVAc adhesive, through the action of lignocellulosiconate, as a cohesive reinforcement of its polymeric structure, and microbiological protein from commercial yeast  
Figure 9: (**a**) Original SEM image of the sample; (**b**) EDS elemental mapping image; (**c**) SEM/EDS elemental spectra analysis of the sample. S. cerevisiae_ and magnesium hydroxide (Mg(OH)\({}_{2}\)). These are agents that enhance the binder-intumescent properties of the adhesive and act synergistically to improve the performance of PVAc adhesive against high temperatures and fire. 3. Given the decrease in relative intensity associated with the identification of benzene, for example, in combustion, it can be concluded that the bioadditive is capable of masking or encapsulating this type of VOC during the regime stage. Furthermore, VOC emissions with high toxic potential (aromatic hydrocarbons, such as benzene, toluene, p-xylene, among others) correspond to the substrate (wood) and not to the adhesive modified by means of the IFR bioadditive. Biological materials, such as the bioadditive, would offer the opportunity to decrease the partial or total CO\({}_{2}\) load during its life cycle. In this case, a biological base of yeast protein was established for the elaboration of this bioproduct to maintain the innocuous characteristics of the PVAc adhesive, when modified with it. Undoubtedly, biological materials are a promising alternative in the development of products that are more responsible for the environment and human beings' health. Conceptualization, M.V.-V., M.N.-D. and D.H.-E.; methodology, M.V.-V., M.N.-D., D.H.-E. and A.F.-P.; software, M.V.-V.; validation, M.V.-V., M.N.-D. and D.H.-E.; formal analysis, M.V.-V.; investigation, M.V.-V.; resources, M.V.-V., M.N.-D., D.H.-E. and A.F.-P; data curation, M.V.-V.; writing--original draft preparation, M.V.-V.; writing--review and editing, M.V.-V.; visualization, M.V.-V.; 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. This research received no external funding. The APC was funded by Centro Nacional de Excelencia para la Industria de la Madera (CENAMAD)--ANID BASAL FB210015. Not applicable. This work information and data are managed by the corresponding author, whose dissemination is restricted due to privacy issues.