TY - JOUR
T1 - Enthalpy relaxation in poly(ethylene terephthalate) and related polyesters
AU - McGonigle, E.A.
AU - Jenkins, S.D.
AU - Liggat, J.J.
AU - Pethrick, R.A.
PY - 2000/11
Y1 - 2000/11
N2 - Enthalpic relaxation data are presented on poly(ethylene terephthalate), poly(ethylene naphthalate) and their copolymers. Analysis of these data allows the determination of the amount of energy absorbed at the glass transition, Qt, and the location of the enthalpic recovery peak, Tmax, as a function of the time of ageing of the samples. Ageing measurements were carried out for periods of up to 2016 h and at temperatures between 40 °C and 110 °C, depending upon the chemical composition of the system being investigated. The enthalpic relaxation rates are influenced by the chemical structure and reflect the effects of local order pinning the chains and influencing the rate of enthalpic recovery.
AB - Enthalpic relaxation data are presented on poly(ethylene terephthalate), poly(ethylene naphthalate) and their copolymers. Analysis of these data allows the determination of the amount of energy absorbed at the glass transition, Qt, and the location of the enthalpic recovery peak, Tmax, as a function of the time of ageing of the samples. Ageing measurements were carried out for periods of up to 2016 h and at temperatures between 40 °C and 110 °C, depending upon the chemical composition of the system being investigated. The enthalpic relaxation rates are influenced by the chemical structure and reflect the effects of local order pinning the chains and influencing the rate of enthalpic recovery.
KW - poly(ethylene terephthalate)
KW - poly(ethylene naphthalate)
KW - copolymers
KW - physical ageing
KW - enthalpy relaxation
KW - DSC
KW - relaxation pinning
UR - http://dx.doi.org/10.1002/1097-0126(200011)49:11<1458::AID-PI529>3.0.CO;2-U
U2 - 10.1002/1097-0126(200011)49:11<1458::AID-PI529>3.0.CO;2-U
DO - 10.1002/1097-0126(200011)49:11<1458::AID-PI529>3.0.CO;2-U
M3 - Article
VL - 49
SP - 1458
EP - 1463
JO - Polymer International
JF - Polymer International
SN - 0959-8103
IS - 11
ER -