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Characterization of macromolecular traits of lignin from heat treated spruce wood by size exclusion chomatography
Názov Characterization of macromolecular traits of lignin from heat treated spruce wood by size exclusion chomatography Aut.údaje Tatiana Bubeníková ...[et al.] Autor Bubeníková Tatiana TUZDFCHTD - Katedra chémie a chemických technológií Spoluautori Luptáková Jana Kačíková Danica TUZDFPO - Katedra protipožiarnej ochrany Kačík František TUZDFCHTD - Katedra chémie a chemických technológií Zdroj.dok. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Vol. 60, no. 2 (2018), s. 33-42. - Zvolen : Technická univerzita vo Zvolene, 2018 Poznámky Lit. Jazyk dok. angličtina Krajina Slovenská republika Systematika 674.032.475.5 Heslá smrekové drevo - spruce wood * dioxánový lignín - dioxane lignin * chromatografické metódy - chromatographic methods * molekulová hmotnosť - molecular weight * polydisperzita - polydispersity Anotácia Lignin composition, functionality, purity, molecular weight distribution and degree of cross - linking are of great interest because of their impact on physicochemical properties and influence on its potential applications . In this study, dioxane lignin from spruc e wood thermally treated at various temperatures (100, 150, 200, 220, 240, 260, 280 and 300 °C) and duration (1, 3 and 5 hours) was investigated by size exclusion chromatography (SEC) using 0.005 M LiBr in DMF on two POLAR - M columns . With increasing temperature and duration of treatment the degradation and condensation reactions take place in lignin. At the temperatures till 200 - 240 °C , the degradation and condensation reactions take place simultaneously, but the lignin macromolecule condensation is predominant, and the molecular weights increase. At the temperatures over 240 °C , the decomposition of high molecular fractions of lignin takes place. U nder mild conditions of thermal treatment , the extraction of lignin from wood increased , and with increa sed severity of treatment it decreased rapidly . URL https://df.tuzvo.sk/sites/default/files/03-02-18_0_0_0_0_0.pdf Kategória publikačnej činnosti ADN Báza dát xcla - ČLÁNKY Druh dok. RBX - rozpis článkov z periodík Odkazy PERIODIKÁ-Súborný záznam periodika Zväzky 2018: 1-2 
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Počet záznamov: 1