Experimental modelling of the interaction of oligoether acrylate MGF-9 with lignin in the process of flax fibre biomodification
V. A. ZYABLOV, S. V. ALEEVA, S. A. KOKSHAROV
Ivanovo State Polytechnic University, Ivanovo, Russia
Keywords: flax fibre, redox transformation of lignin, oligoacrylate, interaction, IR spectroscopy
Abstract
The study is part of the project aimed at solving actual problems in overcoming the limitations of the practical application of flax fibre reinforced composites due to their insufficient moisture resistance. We are implementing a biomimetic approach to reproduce the state of the flax xylem cell wall, which has a uniquely stable structure under permanent contact with moisture absorbed from the soil. Carrying out a special bio-treatment of the fibrous material and impregnating it with a low-viscosity binder to block the porous system of elementary fibres can ensure the creation of a polymer exoskeleton that can prevent swelling of the textile base of the composite in a humid environment. The conditions for using oligoacrylates as a low-viscous binder for the flax-containing composite have been determined, implementing an alternative variant of their curing to avoid undesirable consequences of typical polymerisation modes involving peroxide initiators. The experiments simulate the conditions of redox transformation of lignin in the process of biomodification of linen materials in combination with the treatment with oligoether acrylate MGF-9. The method of IR Fourier spectroscopy was used to evaluate changes in the state of one- and bicomponent polymer objects. The integral peaks decomposition makes it possible to isolate the bands of individual vibrations in the interatomic bonds of the studied compounds and quantify the change in their amplitude. The difference between the spectra of the product synthesised through the redox transformations of lignin in the presence of oligoacrylate and the result simulating the sequential modifying treatments of flax fibre material was revealed. Concordant transformations of a number of spectral bands provide evidence of lignin macromolecules defragmentation in combination with the initiated interaction of the oxyaryl units of the biopolymer and vinylidene groups of oligoacrylate, which confirms the formation of a copolymer.
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