BIOMODIFICATION OF FLAX RAW MATERIALS FOR COMPOSITE APPLICATIONS: EFFICIENCY OF BAST FIBER BUNDLE SEPARATION
UDC 677.021.15/.18+678.046.5
Abstract
The number one task in the preparation of flax fiber materials for the composite industry is to increase the uniformity of separation of bast bundles, which will make it possible to offset the influence of natural anisotropy of geometric and structural parameters of elementary fibers and to strengthen interfacial interaction with the polymer binder. The object of the study is the decorticated fibre of the breeding varieties of fiber flax Alexim. The purpose of the work is to substantiate approaches to determining the composition of a polyenzyme composition and the conditions of bio-treatment for effective cleavage of incrusted residues of bast parenchyma. The study was carried out using the methods of scanning electron microscopy, visible and IR spectroscopy, and dynamic light scattering, physico-chemical methods of enzyme activity analysis, as well as standard textile materials science methods to evaluate the linear density and flexibility of carded fibers. The selection of enzymes was carried out based on the results of determining the required substrate specificity, as well as taking into account the size of their globule. The maximum decrease in linear fiber density reached 8.7 times with a 3.3-fold increase in flexibility and a 7.1-fold decrease in the coefficient of variation in flexibility.
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