Three phase model in drawn thermoplastic polyesters: comparison of differential scanning calorimetry and thermally stimulated depolarisation current experiments

A new three-phase model to estimate the effective elastic properties of semi-crystalline polymers: Application to PET

“…This explains that in our three-phase composite inclusion model, the influence of the intermediate phase is more and more important as the crystalline volume fraction increases. To the best of our knowledge, there are no available results in the literature to better estimate the elastic properties of the intermediate phase even if the structure of semicrystalline polymer interphases has been the subject of several investigations both by experimental techniques and theoretical methods (Balijepalli and Rutledge, 2000;Kattan et al, 2002;Wunderlich, 2003Wunderlich, , 2005Righetti et al, 2007). The knowledge of the morphology of semicrystalline polymers and of the properties of the intermediate phase would help improve the predictive capability of our proposed three-phase model (3PCI).…”

Average size of cooperative rearranging regions and fragility in a drawn poly(ethylene terephthalate) at the glass transition

“…Moreover, as shown by Wunderlich [25], this type of semi-crystalline polymers must be described by a three-phase model taking into account a 'rigid' amorphous fraction (RAF). This third phase is a transitional region located between crystalline and mobile amorphous regions (or undisturbed amorphous region) [34]. For the lowest draw ratio (k < 3), the degree of crystallinity is weak (X c lower than 20%) and the degree of RAF close to 20% [34].…”

“…This third phase is a transitional region located between crystalline and mobile amorphous regions (or undisturbed amorphous region) [34]. For the lowest draw ratio (k < 3), the degree of crystallinity is weak (X c lower than 20%) and the degree of RAF close to 20% [34]. In consequence, the amorphous phase percentage is close to 60%.…”

“…For the highest draw ratio (4 < k < 7) the crystallinity degree is close to 40%, the RAF degree close to 30%. Therefore, this leads to a amorphous phase percentage close to 30% [34], leading a decrease of CRR average size.…”

Relaxation in poly-(ethylene terephthalate glycol)/montmorillonite nanocomposites studied by dielectric methods

“…TSDC measurements, described in detail elsewhere [19], were performed with apparatus developed in our laboratory. At a polarization temperature T p just above T g (in our case 363 K), samples were subjected to an electrical field (E = 10 6 V/m) for 2 min.…”