Surface characteristics of Pine and Heat-treated Spruce Modified with Alkoxysilanes by Sol-gel process

S. Wang, Riitta Mahlberg, Saila Jämsä, Juha Mannila, Juha Nikkola, J. Peltonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The surface morphologies and moisture behaviour of pine (Pinus sylvestris) sapwood and heat-treated spruce (Picea abies) deposited with two types of silane-based sol-gel coatings were studied by Atomic Force Microscopy (AFM), water contact angle and water uptake measurements. The distributions of sol-gel coatings on wood surfaces were investigated by Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS). The two sol-gel coatings differed in terms of organic aliphatic chain length. The AFM results revealed that the sol-gel coatings applied by spreading covered the fine structure of the wood substrates. Thus, the sol-gel coatings - especially the one with short aliphatic chains - had a tendency to smoothen the wood surfaces. It was observed from the ToF-SIMS images showing Si ion distribution on treated surfaces that the coatings fully covered pine sapwood surfaces. The thin coating layers formed on heat-treated spruce surfaces followed the original wood surface structure. The contact angle measurements indicated that the water repellent properties of both pine and heat-treated spruce were improved to certain extent by the sol-gel coatings. However, the water absorption tests showed that water uptake was significantly diminished for sol-gel coated pine wood, whereas the relative low water absorption values of heat-treated spruce were affected by the sol-gel coatings.
Original languageEnglish
Title of host publicationProceedings of the PRA's 6th International Woodcoatings Congress
Subtitle of host publication Preserve, Protect, Prolong
Pages402-414
Publication statusPublished - 2008
MoE publication typeA4 Article in a conference publication
EventPreserve, protect, prolong : PRA's 6th International Woodcoatings Congress - Amsterdam, Netherlands
Duration: 14 Oct 200815 Oct 2008

Conference

ConferencePreserve, protect, prolong : PRA's 6th International Woodcoatings Congress
CountryNetherlands
CityAmsterdam
Period14/10/0815/10/08

Keywords

  • sol gel coatings
  • wood
  • AFM
  • Tof-SIMS
  • water repellence
  • water uptake

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