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