期刊
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
卷 29, 期 2, 页码 206-209出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2008.05.001
关键词
Delamination Chemical modification; Mechanical properties of adhesives; Wood
资金
- Wood Biology and Wood Technology
- University of Gottingen with the companies BASF AG, Ludwigshafen, Germany
- BECKER KG, Brakel, Germany
The shear strength, the cohesive wood failure, and the delamination were determined in plywood constructed with veneers of Fagus sp., Betula sp., and Picea sp. impregnated with 0.8,1.3, and 2.3 M 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU). The plywood production process consisted of two steps: firstly impregnation and curing of the veneers, and secondly assembly of the panel. The adhesive used was a phenolic resin. The values obtained for shear strength were above the standard limit of rejection (1 N mm(-2)), and therefore the samples met the European requirements of plywood designed for exterior conditions. The phenolic resin improved its adhesive ability when the samples were heated for 72h at 95 degrees C. The highest shear strength for modified wood was 3.97 +/- .45 N mm(-2) at 0.8 M, 3.39 +/- 0.26 N mm(-2) at 1.3 M, and 2.35 +/- 0.23 N mm(-2) at 2.3 M, for Betula sp., Fagus sp., and Piceo sp., respectively. The samples constructed with unmodified veneers presented higher shear strengths and higher cohesive wood failures than the samples constructed with modified veneers. The possible effect of the two-steps production of the plywood is discussed. The delamination test of DMDHEU-modified Betula sp. and Fagus sp. plywood showed no open glue lines, while the samples of Picea sp. treated with the higher concentration of DMDHEU suffered delamination. (C) 2008 Elsevier Ltd. All rights reserved.
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