Journal Paper

Paper Information

Journal: JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY | Year:1389 | Volume:17 | Issue:3 | Start Page:113 | End Page:124

video

sound

Persian Version

View:

170

Download:

89

Cites:

Information Journal Paper

Title

INVESTIGATION OF MICROSCOPIC STRUCTURE AND CHEMICAL CHANGES IN BEECH WOOD DURING WEATHERING PROCESS

Writers

AKHTARI M.

Pages

 Start Page 113 | End Page 124

Keywords

FOURIER TRANSFORM INFRARED (FTIR)Q2
SCANNING ELECTRON MICROSCOPY (SEM)Q2

Abstract

 In this study BEECH WOOD (Fagus orientalis Lipsky) samples with dimentions of 150´75´5 mm were prepared and subjected to a variety of ARTIFICIAL WEATHERING conditions in an Atlas Xenon Test Beta LM Weatherometer to UV radiation (300 nm) and visible light (750 nm) and water spray in different times (50, 150 and 300 h). Then wood surface was analyzed for chemical and structural changes using Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM), respectively. Results showed that weathering process affected the functional groups on the wood surface. Full weathering (light and water) damaged the surface polymer structure and caused chemical and physical changes in wood. The greatest changes occurred in the functional groups and aromatic structure of lignin. With increasing of weathering time, the absorption intensity of c=o loonds increased at 1730-1740 cm-1 and aromatic skeletal vibration in intensity 1514 cm-1 decreased. By the effect of UV radiation, choromophoric groups were produced in lignin. Photochemical cleavage of C-C bonds adjacent to carbonyl groups made the chemical compounds smaller and water-soluble. The SEM results showed that the surface of wood exposed to weathering undergoes distinct physical changes and the surface degradation appears to be directly proportional to the time of exposure to the weathering conditions. However, trace changes were observed in samples weathered for 50h.

Cites

  • No record.
  • References

  • No record.
  • Related Journal Papers

    Related Seminar Papers

  • No record.
  • Related Plans

  • No record.





  • Advertising

    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID
    مرکز اطلاعات علمی SID