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Thermal modification leads to the degradation of the compounds in wood, thereby changing the chemical composition of wood, which can affect the further wood finishing. In order to determine the effect of thermal modification on wood finishing, it is important to know the properties of its surface. In this research, the influence of thermal modification on pH, surface free energy, contact angle of coating and chemical composition of beech wood was studied. The results of this study show that acidity and water contact angle on beech wood was higher and polar component of surface free energy was lower after thermal modification. Furthermore, contact angle of waterborne coating on beech wood was increased by increasing the modification temperature and the content of extractives soluble in hot water and in organic solvent was increased after thermal modification of beech wood.Toplinska modifikacija uzrokuje razgradnju spojeva u drvu, čime se mijenja kemijski sastav drva što može utjecati na njegovu površinsku obradu. Kako bi se utvrdio učinak toplinske modifikacije na površinsku obradu drva, važno je znati svojstva njegove površine. U ovom je radu istraživan utjecaj toplinske modifikacije na pH drva, njegovu slobodnu površinsku energiju, kvašenje premaza i na kemijski sastav bukovine. Rezultati istraživanja pokazuju da je toplinska modifikacija povećala kiselost drva i kut kvašenja vode na bukovini i smanjila polarne komponente slobodne površinske energije. Nadalje, kut kvašenja vodenog premaza na bukovini povećao se s povećanjem temperature modifikacije, a sadržaj ekstraktiva topljivih u vrućoj vodi i organskom otapalu povećao se nakon toplinske modifikacije bukovine

Influence of Thermal Modification on Surface Properties and Chemical Composition of Beech Wood (Fagus sylvatica L.)