Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

/ E. A. Tyutkova [et al.] // J. Therm. Anal. Calorim. - 2017. - Vol. 130, Is. 3. - P1391-1397, DOI 10.1007/s10973-017-6550-7. - Cited References:33 . - ISSN 1388-6150. - ISSN 1588-2926РУБ Thermodynamics + Chemistry, Analytical + Chemistry, Physical

Аннотация: This paper deals with the results of a study of the thermodestruction of the earlywood and latewood in the 1988-1998 growth rings of Gmelin larch (Larix gmelinii (Rupr.) Rupr.) trees growing along the polar tree line (70(A)52'53aEuro(3)N, 102A degrees 58'26aEuro(3)E, Taimyr Peninsula). The study used methods of thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC). Thermogravimetric data obtained were analyzed by Ozawa-Flynn-Wall kinetic model. We determined macrokinetic parameters of thermodestruction. Earlywood and latewood showed no significant difference in cellulose/hemicellulose/lignin ratio, whereas they differed significantly in destruction average value of activation energy (197.55 and 55.90 kJ mol(-1), respectively). Our analysis of the correlation of thermodestruction values with mean monthly air temperature and precipitation revealed that component composition of both earlywood and latewood was influenced more by the weather conditions at the beginning of the growing season (April-June). Air temperature had markable influence on the wood component composition during cell wall synthesis only in latewood, whereas precipitation influenced the composition in both latewood and earlywood. TG/DTG and DSC methods were found to be promising for developing information on biochemical composition of early and latewood tracheids in stems and for identifying the extent of the influence of climatic changes on cell wall synthesis.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Forest Inst, Lab Phys & Chem Biol Woody Plants, Akad Dorodork 50-28, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Forest Inst, Dendroecol Dept,Lab Tree Ring Struct, Krasnoyarsk, Russia.

Доп.точки доступа:
Tyutkova, E. A.; Loskutov, S. R.; Shashkin, A. V.; Benkova, V. E.

/ O. Shapchenkova, S. Loskutov, A. Aniskina [et al.] // Eur. J. Wood Wood Prod. - 2021, DOI 10.1007/s00107-021-01763-6. - Cited References:56. - The work was carried out as part of GINOP-2.3.315-2016-00038, "Further processing of wood and wood products based on green chemistry and technology, through creating modern research infrastructure" in the framework of the Szechenyi 2020 Program. The implementation of this project is supported by the European Union, co-financed by the European Regional Development Fund. . - Article in press. - ISSN 0018-3768. - ISSN 1436-736XРУБ Forestry + Materials Science, Paper & Wood

Аннотация: This paper presents a thermal characterization of hardwoods of Hungarian origin. The study covers the wood of the following tree species: sessile oak (Quercus petraea), beech (Fagus sylvatica), hornbeam (Carpinus betulus), black locust (Robiniapseudoacacia), lime (Tilia platyphyllos), ash (Fraxinus ornus), maple (Acer campestre), alder (Alnus glutinosa), and aspen (Populus tremula). Wood samples were subjected to differential scanning calorimetry and thermogravimetry in an air atmosphere at different heating rates of 10, 20, and 40 degrees C center dot min(-1). The activation energy was calculated using the Flynn-Wall-Ozawa method. Thermogravimetric analysis revealed that tree species differed considerably in the mass loss and the temperature of the maximum mass loss rate related to the thermal degradation of the main wood components and the oxidation of char mainly derived from lignin. Beech, hornbeam and ash were characterized by a high mass loss attributed to decomposition of hemicelluloses. The mass loss assigned to the thermal degradation of cellulose varied from 35.41% (ash wood) to 53.65% (alder wood). Sessile oak wood showed the greatest mass loss and the highest temperature of thermoxidation of residual lignin and char. Calorimetrically measured values of the exothermic effect of the wood thermal degradation were in the range 7.93-9.65 kJ g(-1). The average values of activation energy for the thermal degradation of carbohydrates and the thermoxidation of residual lignin and char were found to be 176.0 divided by 197.3 kJ mol(-1)and 196.4 divided by 319.5 kJ mol(-1), respectively.

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Держатели документа:
Krasnoyarsk Sci Ctr SB RAS, VN Sukachev Inst Forest SB RAS, Fed Res Ctr, Krasnoyarsk, Russia.
Univ Sopron, Sopron, Hungary.

Доп.точки доступа:
Shapchenkova, Olga; Loskutov, Sergei; Aniskina, Antonina; Borcsok, Zoltan; Pasztory, Zoltan; Szechenyi 2020 Program [GINOP-2.3.315-2016-00038]; European UnionEuropean Commission; European Regional Development FundEuropean Commission