Academic thesis
| Anna Egeler: | Bonding wood with methyl cellulose Tensile shear and 3-point bending tests on overlapping glued limewood specimens | Back |
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| Abstract: | In this work, cellulose ethers - especially methyl cellulose - were examined for their properties as adhesives for wood. Fundamental theoretical considerations on this topic were followed by empirical data surveys and their evaluation. For this purpose, overlapping glued (lime) wood specimens were tested on a materials testing machine using the tensile shear and 3-point bending method. The maximum forces and the fracture patterns were evaluated and compared. In order to determine the influence of different parameters on a methyl cellulose-based bond, comparative test series were carried out, each with one varying parameter. From this, propositions could be derived on the pressing pressure, test speed, pressing time, drying time and type of wood of the substrate being glued. For this, he highly viscous methyl cellulose Methocel A4M 10% was used as adhesive. Moreover, methyl celluloses with differing degrees of polymerization (Methocel A15; Benecel A4C; Methocel A15C; Methocel A4M) were compared to each other in various molar concentrations. Further, the addition of alcohol to the solution was examined. To contextualize gained results regarding the methyl celluloses, a PVAc dispersion (Mowilith D50) and a gelatin (type A, 240 Bloom) were tested likewise. The generated data ought to provide not only a more objective guide for the selection of a suitable wood adhesive, but also reference values for the practical application of methylcellulose products. |
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