Počet záznamov: 1
Characterization of macromolecular traits of lignin from heat treated spruce wood by size exclusion chomatography
SYS 0098633 LBL 00000naa^^22^^^^^^^^450 005 20181031104155.7 017 70
$a 10.17423/afx.2018.60.2.03 $2 DOI 100 $a 20181031a m y0sloy0103 ba 101 0-
$a eng 102 $a SK 200 1-
$a Characterization of macromolecular traits of lignin from heat treated spruce wood by size exclusion chomatography $f Tatiana Bubeníková ...[et al.] 215 $c Grafy, tab. 320 $a Lit. 330 $a 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 . 463 -1
$1 001 sldk_un_cat*0098014 $1 011 $a 1336-3824 $1 200 1 $a Acta Facultatis Xylologiae Zvolen $e vedecký časopis Drevárskej fakulty $v Vol. 60, no. 2 (2018), s. 33-42 $1 210 $a Zvolen $c Technická univerzita vo Zvolene $d 2018 610 1-
$9 sldk_un_auth*h005962 $a smrekové drevo $X spruce wood 610 1-
$9 sldk_un_auth*h029917 $a dioxánový lignín $X dioxane lignin 610 1-
$9 sldk_un_auth*h016485 $a chromatografické metódy $X chromatographic methods 610 1-
$9 sldk_un_auth*h010011 $a molekulová hmotnosť $X molecular weight 610 1-
$9 sldk_un_auth*h014536 $a polydisperzita $X polydispersity 675 $a 674.032.475.5 $v 2. stred. $z slo 700 -1
$3 sldk_un_auth*p0041189 $a Bubeníková $b Tatiana $f 1975- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 701 -1
$3 sldk_un_auth*0050808 $a Luptáková $b Jana $f 1984- $4 070 701 -1
$3 sldk_un_auth*p0015986 $a Kačíková $b Danica $f 1964- $p TUZDFPO $4 070 $T Katedra protipožiarnej ochrany 701 -1
$3 sldk_un_auth*p0015985 $a Kačík $b František $f 1958- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 801 -0
$a SK $b ZV001 $c 20181031 $g AACR2 856 4-
$u https://df.tuzvo.sk/sites/default/files/03-02-18_0_0_0_0_0.pdf
Počet záznamov: 1