| Issue |
Europhys. Lett.
Volume 43, Number 2, July II 1998
|
|
|---|---|---|
| Page(s) | 201 - 206 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00340-1 | |
| Published online | 01 September 2002 | |
Anisotropic effects of the glass transition in oriented polyethylene
Abteilung für Experimentelle Physik, Universität Ulm - D-89069 Ulm, Germany
Received:
18
July
1997
Accepted:
29
May
1998
The influence of orientation on the glass transition of semicrystalline
polyethylene was investigated using Brillouin spectroscopy. Orientation was
achieved by drawing the sample to 6.55 times its original length. The
temperature range covered was 100–300 K. By performing the second
logarithmic derivative of the longitudinal sound velocity vs. temperature
graph the glass transition is found by a pronounced minimum. In the
isotropic sample it takes place at 
. This curve
nearly coincides with that found from longitudinal sound velocity in chain
direction of the oriented sample. Perpendicular to the chains no effect
shows up. As is discussed, thermal expansion can be ruled out as an
explanation of this strong anisotropic effect.
PACS: 64.70.Pf – Glass transitions / 81.05.Kf – Glasses (including metallic glasses) / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering
© EDP Sciences, 1998
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