Startseite Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors
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Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors

  • Linping Wang , Yasumitsu Uraki EMAIL logo , Keiichi Koda , Aori Gele , Xuesong Zhou und Fangeng Chen
Veröffentlicht/Copyright: 17. Oktober 2018
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Holzforschung
Aus der Zeitschrift Holzforschung Band 73 Heft 4

Abstract

The molar mass (MM) and polydispersity indices (PDI) of acetylated hardwood kraft lignin (Ac-HWKL) and Ac-HWKL fractions were measured by size-exclusion chromatography with multi-angle laser light scattering (SEC-MALLS). The detectors worked at LL658 nm and LL785 nm. The MM of Ac-HWKL measured at 785 nm was much smaller than that measured at 658 nm. The number-average (Mn) and weight-average (Mw) molar masses of Ac-HWKL determined at 785 nm were approximately 6.2 and 6.5 times larger, respectively, than the values estimated using a conventional calibration curve created with authentic polystyrene standards in tetrahydrofuran (THF). Based on the Mw of Ac-HWKL fractions, the Mark-Houwink-Sakurada equation for Ac-HWKL was established to be [η]/ml g−1=0.320 M0.24 in THF and [η]/ml g−1=0.142 M0.26 in dimethyl sulfoxide (DMSO). These results demonstrate that Ac-HWKL has a more compact structure in an organic solvent than polystyrene.

Keywords: absolute molar mass; acetylated hardwood kraft lignin; fractionation; multi-angle laser light scattering (MALLS)

Acknowledgment

We are very grateful to Dr. Antje Potthast for giving us useful suggestions and discussions to prepare this paper.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Our research work was financially supported by JSPS KAKENHI (Grant-in-Aid for Scientific Research (A)) Funder Id: 10.13039/501100001691, Grant Numbers 26252022 and 18H03954.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2018-0119).

Received: 2018-05-23
Accepted: 2018-09-17
Published Online: 2018-10-17
Published in Print: 2019-04-24

©2019 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. Rapid identification of wood species by near-infrared spatially resolved spectroscopy (NIR-SRS) based on hyperspectral imaging (HSI)
  4. Comparison of various multivariate models to estimate structural properties by means of non-destructive techniques (NDTs) in Pinus sylvestris L. timber
  5. Influence of length on acoustic time-of-flight (ToF) measurement in built-in structures of Norway spruce timber
  6. Characterization of Pinus nigra var. laricio [Maire] bark extracts at the analytical and pilot scale
  7. Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors
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  9. Prediction of physical and mechanical properties of thermally modified wood based on color change evaluated by means of “group method of data handling” (GMDH) neural network
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https://doi.org/10.1515/hf-2018-0119
Schlagwörter für diesen Artikel
absolute molar mass; acetylated hardwood kraft lignin; fractionation; multi-angle laser light scattering (MALLS)

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. Rapid identification of wood species by near-infrared spatially resolved spectroscopy (NIR-SRS) based on hyperspectral imaging (HSI)
  4. Comparison of various multivariate models to estimate structural properties by means of non-destructive techniques (NDTs) in Pinus sylvestris L. timber
  5. Influence of length on acoustic time-of-flight (ToF) measurement in built-in structures of Norway spruce timber
  6. Characterization of Pinus nigra var. laricio [Maire] bark extracts at the analytical and pilot scale
  7. Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors
  8. Moisture-induced deformation in the neck of a classical guitar
  9. Prediction of physical and mechanical properties of thermally modified wood based on color change evaluated by means of “group method of data handling” (GMDH) neural network
  10. A self-cleaning surface based on heat treatment of g-C3N4-coated wood prepared by a rapid and eco-friendly method
  11. Mechanical, thermo-mechanical and water uptake performance of wood flour filled polyurethane elastomer eco-composites: influence of surface treatment of wood flour
  12. Investigation of a new formaldehyde-free adhesive consisting of soybean flour and Kymene® 736 for interior plywood
  13. Negative oxygen ion (NOI) production by enhanced photocatalytic TiO2/GO composites anchored on wooden substrates
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