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The current trend in the construction industry is the effort to achieve sustainable development using rapidly renewable materials instead of limited ones. Need for the development of environmentally friendly products is related to the industrial interest in the use of natural plant fibres as reinforcement in composites. The attention is given to hemp fibres as a substitute for synthetic fibres due to their unique mechanical, thermal insulation, acoustic and antiseptic properties. Key problem for successful application of hemp hurds as reinforcement into composites is its high moisture sorption and its heterogeneity what lead to low cohesion of fibres to the matrix. Optimizing the adhesion of plant fibre to inorganic matrix is related to the modification of hemp surface. The objective of this paper is comparison of changes in FTIR spectras caused by combination of physical and chemical modification of hemp material with unmodified sample. Modification of hemp hurds was carried out by ultrasonic treatment and as the cleaning medium were used deionized water and NaOH solution.

OPTIMIZATION OF ORGANIC FILLER PROPERTIES BY ITS PHYSICAL TREATMENT