Fragility index of drawn or annealed poly(ethylene terephthalate) films studied by thermally stimulated depolarisation currents

Saiter, Jean‐Marc; Dargent, Éric; Kattan, M.; Cabot, C.; Grenet, J.

doi:10.1016/s0032-3861(03)00312-4

Cited by 32 publications

(21 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is the so-called 'return to Arrhenius', such that the temperature independent product xDh * corresponds to the activation energy of the motions in the frozen, non-annealed glass, which can be, in this context, identified with E a (T M ), the activation energy determined by TSDC. [58][59][60] This idea appears as a reasonable hypotheses that explains, at least in some cases, the discrepancies between the fragility values obtained by TSDC, m(tsdc), and by DRS, m(drs). A very small value of the x parameter indicates an extremely non-linear relaxation.…”

Section: Glass Transition Relaxation and Fragilitymentioning

confidence: 76%

Slow molecular mobility in the crystalline and amorphous solid states of glucose as studied by thermally stimulated depolarization currents (TSDC)

Diogo¹

2008

Carbohydrate Research

View full text Add to dashboard Cite

Section: Glass Transition Relaxation and Fragilitymentioning

confidence: 76%

Slow molecular mobility in the crystalline and amorphous solid states of glucose as studied by thermally stimulated depolarization currents (TSDC)

Diogo¹

2008

Carbohydrate Research

View full text Add to dashboard Cite

“…In general, polymers present the most fragile liquids. [35] For PET the value of m is 166 [36] that means it is more fragile than PS, whose m value is 139. [35] PET demonstrates a larger relative variation in E than PS.…”

Section: Resultsmentioning

confidence: 99%

Variation of the Effective Activation Energy Throughout the Glass Transition

Vyazovkin¹,

Sbirrazzuoli²,

Dranca³

2004

Macromol. Rapid Commun.

View full text Add to dashboard Cite

Summary: An advanced isoconversional method has been applied to determine the effective activation energies (E) for the glass transition in polystyrene (PS), poly(ethylene terephthalate) (PET), and boron oxide (B2O3). The values of E decrease from 280 to 120 kJ · mol−1 in PS, from 1 270 to 550 kJ mol−1 in PET, and from 290 to 200 kJ mol−1 in B2O3. It is suggested that a significant variation in E should be observed for the fragile glasses that typically include polymers.Variation in the effective activation energy of PS, PET, and B2O3 with temperature.imageVariation in the effective activation energy of PS, PET, and B2O3 with temperature.

show abstract

“…Characteristics of PET were also studied by the relaxation and other techniques with respect to the effects of macromolecular orientation on the structural relaxation mechanisms [302], fragility index of drawn or annealed PET [303], secondary dielectric relaxation in amorphous PET [304], space-charge formation and contact effects in metal-PET films-metal systems and the influence of heat treatments [305][306][307], cold crystallization effect on relaxations of amorphous PET [308] and relaxation in semicrystalline PET [309].…”

Section: -330 K) the Authorsmentioning

confidence: 99%