TY - JOUR
T1 - The evolution of material properties during physical aging
AU - McKenna, Gregory B.
AU - Leterrier, Yves
AU - Schultheisz, Carl R.
PY - 1995/3
Y1 - 1995/3
N2 - Aging experiments using the NIST (National Institute of Standards and Technology) torsional dilatometer have been performed in which the temperature of an isothermally equilibrated epoxy glass was abruptly changed to a new temperature T0 and the evolution of the volume and torsional relaxation responses recorded. The results of down‐jump and up‐jump experiments were found to differ dramatically. Not only is the normal asymmetry of volume approach to equilibrium found, but the mechanical responses are found to evolve differently from the volume response, contrary to simple free volume models of the physical aging process. It is found that the torsional modulus changes with increasing time after the T‐jump. In the case of the down‐jump the evolution of the modulus ceases prior to that of the volume of the sample. In the up‐jump experiment, the contrary is true, viz., the modulus continues to evolve after the volume has attained its equilibrium value. The implications of this for the description of material behavior are discussed.
AB - Aging experiments using the NIST (National Institute of Standards and Technology) torsional dilatometer have been performed in which the temperature of an isothermally equilibrated epoxy glass was abruptly changed to a new temperature T0 and the evolution of the volume and torsional relaxation responses recorded. The results of down‐jump and up‐jump experiments were found to differ dramatically. Not only is the normal asymmetry of volume approach to equilibrium found, but the mechanical responses are found to evolve differently from the volume response, contrary to simple free volume models of the physical aging process. It is found that the torsional modulus changes with increasing time after the T‐jump. In the case of the down‐jump the evolution of the modulus ceases prior to that of the volume of the sample. In the up‐jump experiment, the contrary is true, viz., the modulus continues to evolve after the volume has attained its equilibrium value. The implications of this for the description of material behavior are discussed.
UR - http://www.scopus.com/inward/record.url?scp=0029271327&partnerID=8YFLogxK
U2 - 10.1002/pen.760350505
DO - 10.1002/pen.760350505
M3 - Article
AN - SCOPUS:0029271327
SN - 0032-3888
VL - 35
SP - 403
EP - 410
JO - Polymer Engineering & Science
JF - Polymer Engineering & Science
IS - 5
ER -