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Modification of hemicelluloses with polycarboxylic acids

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Published/Copyright: May 24, 2013
Holzforschung
From the journal Holzforschung Volume 67 Issue 5

Abstract

Polycarboxylic acids (PCAs) aroused interest as crosslinking agents for natural polymers, such as cellulose, starch, chitosan, and hemicelluloses (HC), for improving their water resistance and imparting them new properties. Here, PCAs were studied for the crosslinking of HC films. HCs were isolated from gray alder (Alnus incana L.) wood as a water-soluble fraction by sawdust extraction with 7% potassium hydroxide. Citric acid (CA), maleic acid (MA), and butane tetracarboxylic acid (BTCA) served as crosslinking agents in the presence of sodium hypophosphite as a catalyst. The crosslinking reaction was followed by the analysis of free and esterified COOH groups in HC films. At temperatures below 100–110°C, the HC esterification process with BTCA proceeded very slowly. At 140°C, most of the acids’ COOH groups reacted with HC during 1–1.5 h. BTCA had a higher esterification activity than CA and MA. The obtained films retained their form on immersing in water and subsequent drying in the open air. The water retention value of films followed the reaction kinetics, that is, decreased with increasing reaction time. Water-resistant films were obtained with no <10–11% of BTCA and 20% of CA based on the weight of HC. The water vapor sorption capacity of the films after modification with 10% BTCA decreased approximately twice in the whole range of the relative humidity of air compared with the case of unmodified HC films.

Keywords: crosslinking; hemicelluloses; polycarboxylic acids; water-resistance
Corresponding author: Juris Zoldners, Latvian State Institute of Wood Chemistry, 27 Dzerbenes Str., LV-1006 Riga, Latvia

The study was sponsored by the Latvian State Research Programme “Products with High Additional Value Produced From Wood at Using Biorefinery Technologies.”

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Received: 2012-10-31
Accepted: 2013-4-30
Published Online: 2013-05-24
Published in Print: 2013-07-01

©2013 by Walter de Gruyter Berlin Boston

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https://doi.org/10.1515/hf-2012-0183
Keywords for this article
crosslinking; hemicelluloses; polycarboxylic acids; water-resistance

Articles in the same Issue

  1. Masthead
  2. Masthead
  3. Original Articles
  4. Biorefinery in a pulp mill: simultaneous production of cellulosic fibers from Eucalyptus globulus by soda-anthraquinone cooking and surface-active agents
  5. Thermomechanical pulping of novel Brazilian Eucalyptus hybrids
  6. Contribution of xylan to the brightness development and stability in the final ECF bleaching of eucalypt (Eucalyptus globulus Labill.) kraft pulp
  7. Chemistry and kraft pulping of seven hybrid aspen clones. Dimension measurements on the vessels and UMSP of the cell walls
  8. The role of Donnan effect in kraft cooking liquor impregnation and hot water extraction of wood
  9. Optimization of sulfuric acid-assisted glycerol pretreatment of sugarcane bagasse
  10. Laser-induced fluorescence (LIF) of lignin and lignin model compounds in Raman spectroscopy
  11. Polyoxometalate (POM)-aided modification of lignin from wheat straw biorefinery
  12. Salting-out and salting-in experiments with lignosulfonates (LSs)
  13. Determination of the diffusion of monovalent cations into wood under isothermal conditions based on LiCl impregnation of Norway spruce
  14. Modification of hemicelluloses with polycarboxylic acids
  15. Tailoring the effect of antibacterial polyelectrolyte multilayers by choice of cellulosic fiber substrate
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