4. Conclusions
Three types of polymers [styrenics (poly1), poly
(alkoxycarbonylmethylene) (poly2′), and acrylics (poly3)] containing N-phenylbenzamide group were prepared and their Li conductivities were evaluated. Although the characteristic conduction behavior at lower temperature reported in the literature [7] was not reproduced in our experiments, we succeeded in revealing some unique characters of these polymers with respect to their application as SPE materials: (1) poly2′ shows the highest conductivity among them, clearly indicating the effect of dense packing of the benzamide groups around the polymer backbone, (2) the conductivity of poly2′ exceeds that of PEO, which is the most representative SPE materials, and (3) based on the relationship between the conductivity and Tg, the ion conductive mechanism for these benzamide-containing polymers could be totally different from that derived from segmental motion of polymer chain observed in PEO-based SPEs. These unique characteristics present the promising potential of strategy using densely packed conducting groups and the N-phenylbenzamide group for SPE material development. Further investigation along this line is now underway in this laboratory.
Acknowledgments
This research was supported by JSPS KAKENHI grant numbers
26104525, 15H00755, and 15K05521, and Adaptable and Seamless Technology Transfer Program through target-driven R&D (A-STEP) from the Japan Science and Technology Agency (JST) AS251Z01070M. The authors thank Applied Protein Research Laboratory in Ehime University for its assistance in NMR measurements, and Advanced Research Support Center in Ehime University for its assistance in elemental analysis.