学術雑誌論文

学術雑誌論文

text

Polymer. 2015, 68, p. 221-226

Chain dimensions and intermolecular interactions of polysilanes bearing alkyl side groups over the UV thermochromic temperature

Elsevier

英語

text

2015-06-26

https://doi.org/10.1016/j.polymer.2015.05.018

To elucidate temperature change of intermolecular interactions and chain dimensions for poly(dialkylsilane)s with or without thermochromism, synchrotron-radiation small-angle X-ray scattering and UV-absorption measurements were carried out for relatively low-molar mass poly(n-hexylmethyl)silane (PSi-1), poly(n-decylmethyl)silane (PSi-2), and poly(n-hexylpropyl)silane (PSi-3) samples in isooctane over a wide temperature range down to −94 °C. While the dimensional properties for the three polysilanes were almost irrespective of temperature, the second virial coefficient for PSi-2 and PSi-3 significantly decreased and became negative below the thermochromic temperature at −60 °C and −50 °C, respectively. Analyses in terms of the quasi-two-parameter theory for the wormlike chain showed that conformational change detected by UV-absorption behavior does not cause appreciably the unperturbed chain dimensions of the polysilane samples. Furthermore, aggregates were detected by ultra-small-angle X-ray scattering measurements for high molar mass PSi-3 samples at low temperatures. These results indicate that intermolecular interactions between poly(dialkylsilane) molecules become attractive around the thermochromic temperature.

© 2015 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. https://creativecommons.org/licenses/by-nc-nd/4.0/

54061

Chain dimensions and intermolecular interactions of polysilanes bearing alkyl side groups over the UV thermochromic temperature

Elsevier

英語

2015-06-26

Polymer

68

221

226

https://doi.org/10.1016/j.polymer.2015.05.018

https://hdl.handle.net/11094/54061