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Abstract
The viscoelastic behavior of natural and synthetic materials changes during thermal treatment. Thermomechanical analysis (TMA) is the mthod to determine these mechanical properties directly as a function of time and temperature. Depending on the selected measuring mode either the expansivity (dilatometry), the viscous flow (penetrometry), or the elastic behavior can be investigated. Young's modulus is calculated from flexure and compressive measurements. To give an overivew of these possibilites thermoplastic polymers, poly (methyl methacrylate)(PMMA) and polyethyleneterephthalate (PET), and rubber have been analayzed. The solid transition of a-B quartz revealed a minimum of the Modulus of Elasticity during the transition. Flexure measurements of wood speciments during degradation show the different elastic regions.
The viscoelastic behavior of natural and synthetic materials changes during thermal treatment. Thermomechanical analysis (TMA) is the mthod to determine these mechanical properties directly as a function of time and temperature. Depending on the selected measuring mode either the expansivity (dilatometry), the viscous flow (penetrometry), or the elastic behavior can be investigated. Young's modulus is calculated from flexure and compressive measurements. To give an overivew of these possibilites thermoplastic polymers, poly (methyl methacrylate)(PMMA) and polyethyleneterephthalate (PET), and rubber have been analayzed. The solid transition of a-B quartz revealed a minimum of the Modulus of Elasticity during the transition. Flexure measurements of wood speciments during degradation show the different elastic regions.
Date
9/1991
9/1991
Author(s)
Hans Wiedemann; Rudolf Riesen; Andreas Boller
Hans Wiedemann; Rudolf Riesen; Andreas Boller
Page(s)
84-99
84-99
Keyword(s)
thermomechancal analysis; TMA; Young's modulus; flexure measurement; PMMA; PET; rubber; elasticity; viscoelastic behavior; softening point;
thermomechancal analysis; TMA; Young's modulus; flexure measurement; PMMA; PET; rubber; elasticity; viscoelastic behavior; softening point;