Structural features and water interactions of etherified xylan thin films

Soledad Peresin, Kari Kammiovirta, Harri Setälä, Tekla Tammelin (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

In this paper, the model film approach was used to investigate the structural features and humidity induced changes of the etherified xylan derivatives by using surface sensitive methods. Two routes to modify the birch xylan to generate either cross-linking xylan or more hydrophobic xylan were mastered via allylation and butylation, respectively. Thin nanometer scale model films were prepared by spin-coating and the films were further treated by UV-radical treatment and heat. The structural changes and wetting behaviour of the films before and after the post-treatment procedures were studied using atomic force microscopy and water contact angle measurements. In addition, the water vapour uptake of the xylan derivative films was monitored using quartz crystal microbalance with dissipation (QCM-D) equipped with the humidity module. With the QCM-D, the mass uptake due to the water vapour binding was defined. Simultaneously the changes in the viscoelastic properties of the films when subjected to different relative humidity conditions were determined. We show that the water sensitivity and wetting behaviour of the water soluble xylan derivatives can be altered by cross-linking the film structure and through the molecular rearrangements. Cross-linking and the conformational rearrangements of the allylated xylan reduced the water vapour uptake ability approximately 80 %. Butylated xylan as being a more hydrophobic derivative showed lower ability to uptake water vapour when compared to more hydrophilic xylan derivative. This ability was even further reduced after the post-treatments mainly due to the reassembly of the hydrophobic groups.
Original languageEnglish
Pages (from-to)895-904
Number of pages10
JournalJournal of Polymers and the Environment
Volume20
Issue number4
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Xylans
Thin films
Water
Steam
Water vapor
Derivatives
Atmospheric humidity
Quartz crystal microbalances
Wetting
Allylation
Spin coating
Angle measurement
Contact angle
Atomic force microscopy

Keywords

  • Crosslinking
  • etherifield xylans
  • QCM-D with humidity module
  • water vapour uptake
  • wetting

Cite this

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title = "Structural features and water interactions of etherified xylan thin films",
abstract = "In this paper, the model film approach was used to investigate the structural features and humidity induced changes of the etherified xylan derivatives by using surface sensitive methods. Two routes to modify the birch xylan to generate either cross-linking xylan or more hydrophobic xylan were mastered via allylation and butylation, respectively. Thin nanometer scale model films were prepared by spin-coating and the films were further treated by UV-radical treatment and heat. The structural changes and wetting behaviour of the films before and after the post-treatment procedures were studied using atomic force microscopy and water contact angle measurements. In addition, the water vapour uptake of the xylan derivative films was monitored using quartz crystal microbalance with dissipation (QCM-D) equipped with the humidity module. With the QCM-D, the mass uptake due to the water vapour binding was defined. Simultaneously the changes in the viscoelastic properties of the films when subjected to different relative humidity conditions were determined. We show that the water sensitivity and wetting behaviour of the water soluble xylan derivatives can be altered by cross-linking the film structure and through the molecular rearrangements. Cross-linking and the conformational rearrangements of the allylated xylan reduced the water vapour uptake ability approximately 80 {\%}. Butylated xylan as being a more hydrophobic derivative showed lower ability to uptake water vapour when compared to more hydrophilic xylan derivative. This ability was even further reduced after the post-treatments mainly due to the reassembly of the hydrophobic groups.",
keywords = "Crosslinking, etherifield xylans, QCM-D with humidity module, water vapour uptake, wetting",
author = "Soledad Peresin and Kari Kammiovirta and Harri Set{\"a}l{\"a} and Tekla Tammelin",
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Structural features and water interactions of etherified xylan thin films. / Peresin, Soledad; Kammiovirta, Kari; Setälä, Harri; Tammelin, Tekla (Corresponding Author).

In: Journal of Polymers and the Environment, Vol. 20, No. 4, 2012, p. 895-904.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Structural features and water interactions of etherified xylan thin films

AU - Peresin, Soledad

AU - Kammiovirta, Kari

AU - Setälä, Harri

AU - Tammelin, Tekla

PY - 2012

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