Spectroscopic studies of electron spin resonance and Raman scattering on novel hybrid poly-p-phenylenebenzobisoxazole (PBO) fibers with copper phthalocyanine

ABSTRACT

As was shown in the previous study using X-ray analyses, poly-p-phenylene benzobisoxazole fibers can accommodate copper phthalocyanine molecules with a molecularly-dispersed state in the fiber structure. It is necessary for us to investigate the presence/absence of chemical interactions between the two molecules mentioned above for the purpose to make clear the mechanism why such characteristic structures with the well dispersion of copper phthalocyanine molecules in the hybrid fiber were realized. Spectroscopic analyses based on electron spin resonance and Raman scattering were adopted. Because the copper phthalocyanine molecule take a plane form having D_4h symmetry in an ideal state, the spectra from the molecule would express the consequences based on its symmetry as the shape of the spectrum; the presence of characteristic bands in the spectra would be a proof of the existing state of copper phthalocyanine and poly-p-phenylene benzobisoxazole molecules in the hybrid fiber. It is found that both the spectroscopic methods suggested that there were no chemical bond observed between the two molecules of copper-phthalocyanine and poly-p-phenylene benzobisoxazole in the hybrid fiber.

KEYWORDS:

• Poly-p-phenylenebenzobisoxazole
• copper phtalocyanine
• fiber structure
• dispersion
• Raman spectroscopy
• ESR

Acknowledgements

The present authors express their sincere gratitude to Professor Tashiro of Toyota Technological Institute for his valuable comments and advice for X-ray analyses. Part of this study was performed as a research program at SPring-8 under the identification number of 2015A7212. Thanks are also extended to Ms. Akitomo and Mr. Funaki for their comments and measurements on ESR and micro-focus X-ray diffraction measurements, respectively.