SCIENCE@home

Decay resistance and dimensional stability of Araucaria angustifolia using siloxanes synthesized by sol-gel process

C. Giúdice,P. V. Alfieri,Guadalupe Canosa

Published 2013 in International Biodeterioration & Biodegradation

ABSTRACT

Abstract Solid wood specimens of Araucaria angustifolia were impregnated with alkoxysilanes hydrolyzed and condensed “in situ” by the sol–gel process. Alkoxysilanes selected were aminopropyl methyldiethoxysilane and aminopropyl triethoxysilane ; it was also used the aminopropyl methyldiethoxysilane / aminopropyl triethoxysilane mixture in 50/50 ratio w/w. The pH was adjusted to alkaline value for controlling kinetic of hydrolysis and condensation reactions. Impregnation process was carried out under controlled operating conditions to achieve different weight gains of the chemical modifier. Unmodified and modified wood specimens were exposed to brown rot ( Polyporus meliae ) and white rot ( Coriolus versicolor) under laboratory conditions. The results indicate that the improved resistance to fungal exposure would be based on the wood chemical modification (the protection of cellulose caused by steric hindrance of ≡Si–O–Cellulose preventing the formation of enzyme–substrate complex). Moreover, the results also would be based on the enhanced dimensional stability of the treated wood; the quoted high dimensional stability, which limits the growth of the spores, is supported in the hydrophobicity generated by both the decreasing of the amount of polar hydroxyl groups and the partial occupation of pores with polysiloxanes.

PUBLICATION RECORD

  • Publication year

    2013

  • Venue

    International Biodeterioration & Biodegradation

  • Publication date

    2013-09-01

  • Fields of study

    Materials Science, Chemistry, Environmental Science

  • Identifiers
    DOI 10.1016/J.IBIOD.2013.05.015
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

CITATION MAP

EXTRACTION MAP

CLAIMS

  • No claims are published for this paper.

CONCEPTS

  • No concepts are published for this paper.

REFERENCES

Showing 1-32 of 32 references · Page 1 of 1

CITED BY

Showing 1-26 of 26 citing papers · Page 1 of 1