Abstract
Polysiloxanes possessing 9,9-diarylfluorene moieties (F-PSiOs 3) were synthesized in 83–91% yield by the polycondensation of 9,9-bis(hydroxyaryl or hydroxyethoxyphenyl)fluorenes with Ph2SiCl2 in the presence of pyridine. F-PSiOs with higher molecular weight (Mn 19000–32000, Mw 32000–75000) were obtained, when less polar solvents such as toluene and CCl4 were used as the polymerization solvent. The F-PSiOs showed good solubility toward various organic solvents, high 5% weight loss temperature (Td5: 443–544 °C), and lower glass transition temperature (Tg: 100–171 °C) under nitrogen atmosphere rather than 9,9-diarylfluorene-based polymers reported. On the other hand, no melting point (Tm) was observed owing to the amorphous nature of F-PSiOs. Dynamic viscoelasticity of F-PSiO film was also measured to evaluate the thermal behavior. The transmittance of F-PSiOs in the film state (thickness: 62–70 mm) reached over 90% in the visible region. The F-PSiOs exhibited remarkably high refractive index values in a range of 1.64–1.66 at 589 nm in addition to sufficiently low birefringence values, probably due to the cardo structure of the fluorene moiety placed in the main chain.
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Hayashi, H., Kawasaki, S., Kobori, K. et al. Synthesis and Properties of Polysiloxanes Possessing 9,9-Diarylfluorene Structure in the Main Chain. Polym J 41, 272–278 (2009). https://doi.org/10.1295/polymj.PJ2008241
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DOI: https://doi.org/10.1295/polymj.PJ2008241
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