Download Development of Size-Controlled Silsesquioxane

Development of Size-Controlled Silsesquioxane-Based Element Blocks
Kensuke Naka, Ikuyoshi Tomita (Presenting author underlined)
Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyoku,
Kyoto 606-5627, Japan
[email protected]
1. Introduction (Subtitle in Italic, if necessary)
Optical transparent films of a single polyhedral oligomeric silsesquioxane (POSS) compound are
hardly formed without cross-linking reagents due to their high symmetry and crystallinity. We have
proposed that lower the symmetries of the POSS derivatives decrease their crystallinity and provided
optical transparent film forming properties. In this study, we design imidazolium salts-terminated firstand second-generation poly(amidoamine)-typed POSS core dendrimers as element blocks for
solid-state polyelectrolytes [1].
2. Results and discussion
The imidazolium bromide-terminated first- and second-generation poly(amidoamine)-typed POSS
core dendrimers, denoted as POSS-PIm16Br and POSS-PIm32Br, respectively, were prepared by
reaction of corresponding imidazole-terminated poly(amidoamine)-typed POSS core dendrimers with
1-bromopropane. Wide angle X-ray scattering (WAXS) data for cast films for the imidazoliun
PF6-terminated first- and second-generation POSS core dendrimers, denoted as POSS-PIm16PF6 and
POSS-PIm32PF6, respectively, which were prepared by anion exchange reaction of POSS-PIm16Br
and POSS-PIm32Br, were characterized by the occurrence of two amorphous halos, in which a strong
peak at q = 15 nm-1 and another tiny peak around q = 10 nm-1. Our present X-ray diffraction data for
the cast films of POSS-PIm16PF6 and POSS-PIm32PF6 reflect the same features that were described
for 1-butyl-3-methylimidazolium hexafluorophosphate. Ionic conductivities for the imidazoliun
TFSI-terminated POSS core dendrimers, which were prepared by anion exchange reaction of
POSS-PIm16Br and POSS-PIm32Br, were estimated by ac impedance method after addition of
LiTFSI. The maximum ionic conductivity of 4.03×10-5 S/cm at 50 °C was observed for the lower
generation POSS core dendrimer and lower lithium salts addition.
Figure 1. Imidazolium-terminated POSS core dendrimers and their solid state structures.
[1] Naka, K.; Masuoka, S.; Shinke, R.; Yamada, M. Polym. J., 44, 353-359 (2012).
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