𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Comparative study of mechanical and electrical relaxations in poly(etherimide). Part 1

✍ Scribed by Belana, J.; Cañadas, J. C.; Diego, J. A.; Mudarra, M.; Díaz-Calleja, R.; Friederichs, S.; Jaïmes, C.; Sanchis, M. J.

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
402 KB
Volume
46
Category
Article
ISSN
0959-8103

No coin nor oath required. For personal study only.

✦ Synopsis

Relaxations in poly(etherimide) PEI Ultem 1000 have been analysed by di †erential scanning calorimetry (DSC), dynamic mechanical spectroscopy (DMS), dielectric relaxation spectroscopy (DRS) and thermally stimulated depolarization current (TSDC) measurements. DMTA and DRS results show three distinct relaxations c, b and a in the temperature range [140 to 250¡C. The Ðrst one depends strongly on the water content in the sample as will be discussed in more detail in the second paper of this series. These results are in good agreement with those observed by TSDC of conventionally polarized electrets. In addition to these three relaxations, TSDC measurements show : (1) a peak (o) at which is attributed to space charge temperatures above the a relaxation, (2) indications of structure in the b relaxation zone. In the case of electrets formed by the windowing polarization method, the resulting TSDC spectra allow us to discern the Ðne structure of the b relaxation, which is formed by three subrelaxations. In this work, the activation energies calculated by the di †erent techniques are compared, and a molecular origin for each relaxation is proposed.

1998 SCI.

📜 SIMILAR VOLUMES

Comparative study of mechanical and elec
Comparative study of mechanical and electrical relaxations in poly(etherimide). Part 2
✍ Díaz Calleja, R.; Friederichs, S.; Jaímes, C.; Sanchis, M. J.; Belana, J.; Cañad 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 407 KB

The curves describing the relaxation behaviour of poly(etherimide) at several frequencies shows in the dielectric lossÈtemperature plot c and b relaxations centred at [95¡C and 100¡C, respectively, at 10 Hz. The glassÈrubber relaxation or a process appears at 225¡C at 10 Hz ; at this temperature fre

Morphology, dynamic mechanical, and elec
Morphology, dynamic mechanical, and electrical properties of bio-based poly(trimethylene terephthalate) blends, part 1: Poly(trimethylene terephthalate)/poly(ether esteramide)/polyethylene glycol 400 bis(2-ethylhexanoate) blends
✍ Toshikazu Kobayashi; Barbara A. Wood; Gregory S. Blackman; Akio Takemura 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 744 KB

## Abstract Bio‐based PTT and PTT blends with PEEA of two different ion contents (275 ppm Na and 3515 ppm Na) and PEG 400 bis (2‐ethylhexanoate) were prepared by melt processing. The blends were characterized by differential scanning calorimetry, dynamic mechanical analysis, transmission electron m