? 2021 Slovak University of Technology in Bratislava. All rights reserved.The article examines the ways to solve the problem of developing a scientific basis for obtaining composite materials of different functional purposes from oilseed flax fibers. Composite materials came to the forefront of production and demand for goods several decades ago, thanks to unsurpassed specific and mechanical properties as a result of growing consumer and industry demand for high-tech materials and structures. However, the combination of natural fibers with a polymeric material or matrix increases the difficulty of the process of forming composites and, as a rule, leads to problems in the physicochemical processes of interaction of the matrix and the filler. Composites with synthetic fillers have obvious advantages, but their disposal is difficult, requires the development of environmental processing technologies. The best way to save the environment when processing composite materials is to use nontoxic natural materials for their production, but this requires the development of innovative technologies for forming composite materials with natural fibrous fillers. The paper covers theoretical and experimental research in the area of processing flax raw materials. The purpose of the study is to provide scientific substantiation of developing the technologies for obtaining fillers to reinforce composite materials. In order to do it, we performed modification of oilseed flax fiber and developed technologies for processing oilseed flax straw with regulated technological and performance characteristics. The article also presents the results of the research on determining causes of low wettability of oilseed flax bast. In order to find out the causes of low bast wettability, we conducted research on examining chemical composition and anatomy of straw stems. The formulation for preparing the fiber aimed to be used as filler for reinforcement of composite materials is offered. The study suggests evaluation of the quality of composite materials produced on the basis of using modified oilseed flax fibers.
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