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Performance of thermally modified Scots pine treated with combinations of some modifying chemicals

H. Shen, J. Jiang, J. Cao, Y. Zhu

Abstract


In this study, low-temperature thermally-modified (at 140°C) Scots pine (Pinus sylvestris L.) wood samples were impregnated with either one or more modifying agents, including the brown colorant, paraffin wax emulsion (PWE), and an organic preservative (4,5-dichloro-2-octyl-2H-isothiazol-3-one, DCOIT) microemulsion. All wood samples were assessed in dimensional stability, water absorption, the modulus of rupture (MOR), decay and mold resistance, and their weathering performance under both labscale and outdoor exposure. The results showed that 1) the treating groups with PWE showed obvious lower water absorption, and the lowest value appeared in the group treated with brown colorant and PWE (BCPWE); 2) thermal modification improved the dimensional stability of wood, whereas all the further treatments except the group impregnated with PWE slightly counteracted the effect of thermal modification on dimensional stability after water soaking; 3) the MOR of thermally-modified sample showed little change after further treatments; 4) and thermally-modified wood treated with BC-PWE-DCOIT showed the optimal weathering performance with the least color change and the best mold resistance.


Keywords


wood, thermal treatment, DCOIT, colorant, paraffin wax emulsion

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References


ASTM (2004) G 154–06. Standard practice for operating fluorescent light apparatus for UV exposure of nonmetallic materials. ASTM International ,West Conshohocken, PA.

AWPA (2008) E10-08. Standard method of testing wood preservatives by laboratory soil-block cultures. AWPA’s Technical Committees.

Esteves B, Pereira H. (2008) Wood modification by heat treatment: A review. BioResources 4(1): 370-404.

Esteves B et al. (2013) Chemical changes of heat treated pine and eucalypt wood monitored by FTIR. Maderas. Ciencia y tecnología 15(2): 245-258.

Evans PD et al. (2009) Wax and oil emulsion additives: How effective are they at improving the performance of preservative-treated wood. Forest Prod J 59(1/2): 66.

Gadd GM, Griffiths AJ. (1977) Microorganisms and heavy metal toxicity. Microbial Ecol 4(4): 303-317.

Garcia RA et al. (2014) Color stability of weathered heat-treated teak wood. Maderas. Ciencia y tecnología 16(4): 453-462.

Huang X et al. (2012) Study of the degradation behavior of heat-treated jack pine (Pinus banksiana) under artificial sunlight irradiation. Polym Degrad Stabil 97(7): 1197-1214.

Kielmann BC, Mai C. (2016) Application and artificial weathering performance of translucent coatings on resin-treated and dye-stained beech-wood. Prog Org Coat 95: 54-63.

Kocaefe D et al. (2008) Mechanical properties, dimensional stability, and mold resistance of heat-treated jack pine and aspen. Forest Prod J 58(6): 88-93.

Kristin S, Thabet T, Marnie W, Brajesh D, Timothy T,

Helena S-G, Gabriel B (2005) Relative leaching and

aquatic toxicity of pressure-treated wood products

using batch leaching tests. Environ Sci Technol 39(1):

-163.

Lesar B et al. (2011a) Sorption properties of wood impregnated with aqueous solution of boric acid and montan wax emulsion. J Appl Polym Sci 120(3): 1337-1345.

Lesar B et al. (2011b) Wax treatment of wood slows photodegradation. Polym Degrad Stabil 96(7): 1271-1278.

Lesar B, Humar M. (2011) Use of wax emulsions for

improvement of wood durability and sorption properties. Eur J Wood Wood Prod 69(2): 231-238.

Popescu CM et al. (2011) A thermogravimetric study of structural changes of lime wood (Tilia cordata Mill.) induced by exposure to simulated accelerated UV/Vis-light. J Photoch Photobio A 217(1): 207-212.

Srinivas K, Pandey KK. (2012) Photodegradation of thermally modified wood. J Photoch Photobio B 117: 140-145.

Tiryaki S, Hamzaçebi C. (2014) Predicting modulus of rupture (MOR) and modulus of elasticity (MOE) of heat treated woods by artificial neural networks. Measurement 49: 266-274.

Todaro L et al. (2015) Thermal treatment modifies the calorific value and ash content in some wood species. Fuel 140: 1-3.

Tolvaj L et al. (2014) Colour stability of thermally modified wood during short-term photodegradation. BioResources 9(4): 6644-6651.

Tomak ED et al. (2014) Changes in surface and mechanical properties of heat treated wood during natural weathering. Measurement 53: 30-39.

Wang W et al. (2015) Thermal modification of Southern pine combined with wax emulsion preimpregnation: effect on hydrophobicity and dimensional stability. Holzforschung 69(4): 405-413.

Williams RS. (2005) Handbook of wood chemistry and wood composites. New York. 139 pp.

Yildiz S et al. (2013) Effect of artificial weathering on the properties of heat treated wood. Polym Degrad Stabil 98(8): 1419-1427.


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