Biosourced phenolic resins, based on the phenol-formaldheyde (PF) type, were prepared for their application as coating for wood and wood composites protection, especially against fire. The resins were synthesized by combining an organic polymeric matrix with another inorganic phase. The organic phase was prepared substituting phenol by natural phenolic compounds such as lignin and tannins. The inorganic phase was composed of a nanoclay or a nanosilicate to improve the properties and performance of the resin. Different formulation were elaborated to evaluate the influence of the different components in the final properties and applications of the resins. A physical-chemical and thermal characterization (DSC and TGA analyses) of the resins was carried out prior to their application to determined their properties and thus assess their suitability as coating for wood protection. They showed promising properties especially regarding thermal degradation (the addition of the inorganic phase improved the resins performance). After their characterization, they were tested as coating in two different wood species (pine and beech) and the fireproofing properties were assessed. It was confirmed that the utilization of the resins containing inorganic phase as coating did increment the amount of wood remaining after fire exposure and delayed the time of ignition of the combustion.

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