A STUDY OF THE STRUCTURE OF WOOD DAMAGED BY ROT USING NUCLEAR MAGNETIC RESONANCE
Up-to-date production of fuel pellets has problems associated primarily with insufficient amount of raw material of high quality and its high cost. To increase the productivity of the pelletizing process, it is necessary to use defective trees including those affected by rot. In order to solve the problem of lack of strength of pellets, technical lignin is used as an additive. Various ways to determine the damage rate of wood by rot were investigated in order to know the amount of lignin needed to add to produce a product of high quality. The NMR relaxation method is characterized by simplicity of sample preparation, rapid acquisition of test results, accuracy, undemanding to personnel qualifications, relatively small equipment cost, and safety. In the course of the experiment, we obtained a curve of decrease of the free nuclear induction of the H-NMR sample containing a solid and a mobile phase. Graphs of the relative proportion of solid components and liquid phase shows the dependence of the content of cellulose and lignin in the sample and its moisture rate on the percentage of rotten wood.
/1/ Falk.R. Die Lenzites-faule des Coniferholzes. Molier's Hausschwamm-forschungen. Heft 3, 1909.
/2/ Nikitin N.I., Solechnik N.Ya., Komarov F.P. (1931) Chemical technology of wood. N.I. Nikitina (Eds.), State scientific technical publishing house, Leningrad,
/3/ Nikitin, V.M. (1978) Chemistry of wood and cellulose. V.M. Nikitin, A.V. Obolenskaya, V.P. Scheglov (Eds.), Forest industry, Moscow
/4/ Nikitin N.I. (1962) Chemistry of wood and cellulose. Publishing house of Academy of Sciences SSSR. Moscow-Leningrad
/5/ Vanin S.I. (1931) The rot of the tree, its causes and measures of struggle. Moscow-Leningrad.
/6/ Ripachek, V. (1967) Biology of wood-destroying fungi. Publishing house "Forest industry". Moscow.
/8/ http://www.bruker.com/products/mr/td-nmr/minispec-mq-polymer-research-analyzer /learn-more.html, accessed on 2017-12-25.
https://www.bruker.com/fileadmin/user upload/8-PDF-Docs/MagneticResonance/NMR/ brochures/Crystallinity_app_note_T149125.pdf, accessed on 2017-12-25.
Blyumih, B. (2011) Fundamentals of NMR for scientists and engineers. B. Blyumih. (Eds.), Tehnosfera, Moscow.
/11/ Hertlein, C., Strobl G., Saalwachter K. (2006) Low-field NMR studies of polymer crystallization kinetics: Changes in the melt dynamics. Polymer. no. 47 (20), 7216-7221.
M. Mauri, Y. Thomann, H. Schneider, K. Saalwächter (2008) Spin Diffusion NMR at Low Field for the Study of Multiphase Solids. Solid State Nuclear Magnetic Resonance. no 34, 125-141 DOI: 10.1016 / j.ssnmr.2008.07.001.
Grunin Y.B., Grunin L.Y., Nikol'Skaya E.A., Talancev V.I. (2012) Microstructure of cellulose: NMR relaxation study. Polymer Science. Series A., vol 54, no 3, 201-208.
/15/ Grunin Y.B., Grunin L.Y., Nikol'Skaya E.A., Talancev V.I., Gogelashvili G.Sh. (2015) Features of the structural organization and sorption properties of cellulose. Polymer Science. Series A, vol 57, Iss. 1, 43-51
Pfleiderer B, Xu P, Ackerman JL, Garrido L. (1995) Study of aging of silicone rubber biomaterials with NMR. Journal of Biomedical Materials Research, no. 29, 1129-1140.
Persson B.R., Malmgren L., Salford L. (2012) Studies of H-NMR Relaxation Dispersion in Human Brain-tissue Samples: Implications for Magnetic Resonance Relaxation Dispersion Imaging (MARDI). Acta Scientiarum Lundensia, no 1, 1-22.
Vanhamme L., Sundin T., Van Huffel S., Van Hecke P. (2001) MR spectroscopy quantitation: a review of time-domain methods. NMR in Biomedicine, no 14, 233-246.
/19/ Vanin S. I.,. Bazhenov V. A, Vikhrova E. V. / On the moisture content of healthy and mushroomed wood in the trunks of growing trees / S. I. Vanin, V. A. Bazhenov, E. V. Vikhrova / / Tr. Institute of Forest of the Academy of Sciences of the USSR, 1953, volume 4.
/20/ Perelygina L. M., Pevtsov, A. H. About influence of the initial stage of rotting on physical and mechanical properties of wood of pine, birch, persimmon. / L. M. Perelygina, A. H. Pevtsov, // В сб.: «To the question of replacing scarce wood species», 1933. – The publication CNIIMOD.
/21/ Wood and wood materials. Krasnoyarsk, 1974