Dynamic mechanical analysis of wood and wood-based composites Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rn3013757

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  • Wood and wood-based composites are being used in either new or more demanding applications. A means is needed to successfully analyze new materials and to predict their long-term performance. Two techniques, dynamic mechanical analysis (DMA) and time-temperature superposition (TTS) offer a means to accomplish this objective. The outcome of this study is an analysis method that could be used to evaluate the structural characteristics of wood, resin, and wood-based composites as affected by temperature, frequency, and humidity, and the possibility of using this information to define changes in the production process or product. Dynamic mechanical analysis characterizes a material's properties in terms of the deformation response to periodic forces. To accomplish this analysis, small samples of material were subjected to sinusoidal loads in the center point while the temperature was varied in a controlled manner. The dynamic mechanical properties such as storage modulus, loss modulus, and internal friction were determined, in addition to the glass transition temperature, all as a function of temperature, frequency and moisture content. The applicability of dynamic mechanical analysis (DMA) and time-temperature superposition (TTS) was investigated. The time-temperature superposition principle provides a much broader effective range of frequency by making measurements of the dynamic properties at different temperatures and by shifting the data to construct a master curve. Verification studies confirmed the applicability of DMA/TTS. Dynamic properties of wood and its components of earlywood and latewood were measured. The data was used to successfully predict the properties of wood. The properties of particulate wood-based composites indicate that adhesives play an important role in the temperature dependence of the dynamic properties of wood-based composites. The relationship between dynamic internal friction and static internal bond strength was also investigated. The internal friction measurement is suggested as a potential bonding characterization of wood-based composites.
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