Dynamic Mechanical Behavior of Birch Compared with Methyl Methacrylate Impregnated Birch from 90 Degrees to 475 Degrees K

This research utilized dynamic mechanical spectroscopy as a primary tool to study structure and properties over an extended temperature range. Specimen A was machined from birch dowel stock. Specimen B refers to the same specimen (A) after it had been tested to 475?K in a nitrogen atmosphere and vacuum dried 100 hours at 100?C. Specimen C was machined from a common commercial polymethyl methacrylate (PMMA). Specimen D was a monomer impregnated (methyl methacrylate) birch sample; the monomer was subsequently polymerized with gamma radiation and contained 58 percent PMMA. Dynamic mechanical tests were carried out at frequencies ranging from 2000 Hz to 2600 Hz for the birch specimens and 880 Hz to 1140 Hz for the PMMA. Specimens were supported in a horizontal position and driven in a transverse mode.

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