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Dynamic Mechanical Analysis Duncan Price IPTME, Loughborough University © Copyright: D.M.Price@lboro.ac.uk (2006)
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mechanical testing
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dynamic mechanical analysis
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relationships
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test configurations
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Rubbery plateau is related to M e between cross-links or entanglements T ll in some amorphous polymers T m = melting (1) For thermosets, no T m occurs Rubbery plateau (2) In semicrystalline polymers, a crystal-crystal slip, T * occurs For purely crystalline materials, T g occurs T g is related to molecular mass up to a limiting value transitions are often related to the toughness typical behaviour
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polycaprolactone
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impact resistance in nylon
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material specification
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thermoset cure
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determination of T g
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effect of plasticiser
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stress relief
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PET
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effect of frequency
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frequency domain
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frequency master curve
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effect of molecular weight
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gellation of polymer solution
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thermoset curing
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Gillham-Enns or TTT diagram
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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. K.P. Menard; “Dynamic Mechanical Analysis: A Practical Introduction to Techniques and Applications”, CRC Press, Boca Raton (1999) 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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