The Brillouin spectrum of polyethylene has been measured as a function of temperature. Slope discontinuities of opposite directions have been observed in the Brillouin shift and width near the glass transition temperature. The former is attributed to a corresponding discontinuity in the temperature coefficient of specific volume, while the latter to the onset of long-range coordinated molecular motion near the transition region.
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Ng, S.C., Hosea, T.J.C. & Goh, S.H. Glass transition of polyethylene as studied by Brillouin spectroscopy. Polymer Bulletin 18, 155–158 (1987). https://doi.org/10.1007/BF00261894
- Transition Temperature
- Opposite Direction