Dynamic Mechanical Analysis Duncan Price IPTME, Loughborough University © Copyright: (2006)
mechanical testing
dynamic mechanical analysis
relationships
test configurations
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
polycaprolactone
impact resistance in nylon
material specification
thermoset cure
determination of T g
effect of plasticiser
stress relief
PET
effect of frequency
frequency domain
frequency master curve
effect of molecular weight
gellation of polymer solution
thermoset curing
Gillham-Enns or TTT diagram
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 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