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Thermomechanical Analysis Duncan Price IPTME, Loughborough University © Copyright: D.M.Price@lboro.ac.uk (2006)
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introduction Volume is a fundamental thermodynamic quantity. Thermal expansivity ( ) is a useful engineering quantity: = (dL/dt)/L o Thermomechanical Analysis (TMA) is the study of the relationships between a sample’s length (volume) and its temperature.
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instrumentation
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TMA probe types
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TMA temperature calibration
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thermal expansion of aluminium
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printed circuit board
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effect of load on TMA measurements
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effect of cross linking on TMA penetration
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effect of plasticisers
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relationship between hardness and indentation
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isothermal creep measurements
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measurement of liquids
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effect of chemical structure
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effect of thermal history
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effect of orientation
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sample controlled thermodilatometry
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dynamic load TMA
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summary Intrinsic PropertiesProcess PropertiesProduct Classifications Tg, & probe displacementcure & crosslinkingcarbonaceous materials polymerisationceramics viscoelastic propertiessolvent effectscoatings Young’s modulusfoamingconstruction materials creepphase behaviourcomposites stress relaxationflow modellingdental waxes tensile propertiescrystallisationelastomers viscositydrawing effectsmetals polymers & copolymersviscositypharmaceuticals polymer blendsmold stabilitytextiles polymer morphologyplastics
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recommended reading M. Reading and P.J. Haines; “Thermomechanical, dynamic mechanical and associated methods” in; P. J. Haines; “Thermal methods of analysis: Principles, Applications and Problems” Blackie, London (1995) pp.123-160. A. T. Riga and C. M. Neag (Editors); “Materials Characterization by Thermomechanical Analysis”, ASTM STP 1136, American Society for Testing and Materials, Philadelphia (1991). D. M. Price, “Thermomechanical and Thermoelectrical Methods”, in P.J. Haines (ed.) Principles of Thermal Analysis & Calorimetry, ch. 4, Royal Society of Chemistry, Cambridge (2002) pp. 94-128.
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