CHANGE IN SOME ACOUSTIC PROPERTIES OF WOODS USED IN MUSICAL INSTRUMENTS AFTER CHEMICAL MODIFICATION WITH PROPIONIC ANHYDRIDE

The spruce (Picea orientalis), maple (Acer pseudoplatanus), sapele (Entandrophragma cylindricum), cypress (Cupressus sempervirens) and mulberry (Morus alba) woods, which are among the wood types commonly used in making musical instruments, were subjected to chemical modification by propionic anhydride for 1 h, 3 h and 6 h reaction times. The changes in dimensional stability, sound velocities, modal frequencies and dynamic elasticity modulus values of wood samples after modification were investigated. According to the results obtained, as the weight gain values occurring depending on the reaction time increased, the dimensional stability increased in all wood types. When the acoustic properties were examined, it was determined that individual changes occurred at different values depending on the wood type and chemical modification times.