caa a22 4500 463212177 CHVBK 20180405153144.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s00339-007-3976-y doi (NATIONALLICENCE)springer-10.1007/s00339-007-3976-y Nanoindentation mapping of a wood-adhesive bond [Elektronische Daten] [J. Konnerth, A. Valla, W. Gindl] A mapping experiment of a wood phenol-resorcinol-formaldehyde adhesive bond was performed by means of grid nanoindentation. The variability of the modulus of elasticity and the hardness was evaluated for an area of 17μm by 90μm. Overall, the modulus of elasticity of the adhesive was clearly lower than the modulus of wood cell walls, whereas the hardness of the adhesive was slightly higher compared to cell walls. A very slight trend of decreasing modulus of elasticity was found with increasing distance from the immediate bond line. However, the trend was superimposed by a high variability of the modulus of elasticity in dependence on the position in the wood cell wall. The unexpectedly high variation of the modulus between 12 and 24GPa may be explained by the interaction between the helical orientation of the cellulose microfibrils in the S2 layer of the wood cell wall and the geometry of the three-sided Berkovich type indenter pyramid used. Corresponding to the very slight decrease in modulus with increasing distance from the bond line, a similar but clearer trend was found for hardness. Both trends of changing mechanical properties of wood cell walls with varying distance from the bond line are attributed to effects of adhesive penetration into the wood cell wall. Springer-Verlag, 2007 Konnerth J. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria aut Valla A. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria aut Gindl W. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria aut Applied Physics A Springer-Verlag 88/2(2007-08-01), 371-375 0947-8396 88:2<371 2007 88 339 https://doi.org/10.1007/s00339-007-3976-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3976-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Konnerth J. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria aut NATIONALLICENCE 700 1- Valla A. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria aut NATIONALLICENCE 700 1- Gindl W. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/2(2007-08-01), 371-375 0947-8396 88:2<371 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer