thermomechanical analysis
TRANSCRIPT
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Thermomechanical Analysis
Duncan PriceIPTME, Loughborough University© Copyright: [email protected] (2006)
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introduction
Volume is a fundamental thermodynamic quantity.
Thermal expansivity () is a useful engineering quantity:
= (dL/dt)/Lo
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 Properties Process Properties Product Classifications
Tg, & probe displacement cure & crosslinking carbonaceous materialspolymerisation ceramics
viscoelastic properties solvent effects coatings Young’s modulus foaming construction materials creep phase behaviour composites stress relaxation flow modelling dental waxes tensile properties crystallisation elastomers viscosity drawing effects metalspolymers & copolymers viscosity pharmaceuticalspolymer blends mold stability textilespolymer morphology plastics
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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.