An unusual temperature dependence of light scattering properties by pure polystyrene (PS) was observed in the temperature range of 30—170°C: the V′v and Vviso′ intensities minimized near Tg, and the H′v intensity changed with measuring temperatures. These phenomena can be explained by “the scrambling effects of incident and scattered light” during transmission through the sample, as previously pointed out for PS glass by Claiborne and Crist. The PS sample used was prepared by a very careful procedure in which the evaporable monomer, initiator, and chain transfer agent were distilled in a closed vacuum system and in situ polymerization was carried out above Tg. The corrected Vviso intensity for PS glass was favorably compared with the values calculated from the thermal density fluctuation, indicating that PS glass was in a frozen state near Tg. The corrected Hv intensity for PS glass was nearly equal to the heretofore calculated value, assuming a randomly oriented anisotropic liquid for PS. Our experimental results showed no evidence for an ordered structure in pure PS glass, as is found in pure poly(methyl methacrylate) glass, but PS rubber has a partially oriented state.
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Fujiki, M., Oikawa, S. Light Scattering Study on the Structure of Pure Polystyrene. Polym J 16, 609–617 (1984). https://doi.org/10.1295/polymj.16.609
- Light Scattering
- Local Structure
- Amorphous Polymer
- Scrambling Effects