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标题:Influence of alkoxy tail length on the properties of side chain liquid crystal polymers with aggregation–induced emission enhancement characteristics
时间:2020-01-15 10:56:28
DOI:10.1016/j.eurpolymj.2018.05.020
作者:Yongjie Yuan;Jindi Li;Lifang He
摘要:In this paper, a series of side chain liquid crystal polymers (SCLCPs) containing cyanostilbene cores, alkoxy tail namely poly[(Z)-6-(4-(1-cyano-2-(4-(alkoxy)phenyl)vinyl)phenoxy)hexyl methacrylate]s (abbreviated as PM6PVPCm, m is the alkoxy tail length) were synthesized and the effects of the alkoxy tail length on the properties of the SCLCPs were explored. The structures and properties of the SCLCPs were measured by 1 H nuclear magnetic resonance ( 1 HNMR), thermogravimetric analysis (TGA), polarized optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), ultraviolet spectroscopy (UV) and photoluminescence (PL) measurements. Experimental results showed that all polymers enjoyed excellent thermo-stability, with 5% weight percentage loss temperatures up to 340°C. All polymers also exhibited stable smectic liquid crystallinity and the alkoxy tail length also had a great impact on the mesophase behavior. The clearing point (Ti) showed an increasing trend with increase of the alkoxy tail length. All polymers showed weak emission in dilute solutions while emitted stronger fluorescence when aggregated in non-solvent or in the solid state, displaying an interesting characteristic of aggregation-induced emission enhancement (AIEE). The luminescent properties of polymers are sensitive to alkoxy tail length and their solid-state fluorescence quantum yield increased with the increasing alkoxy tail length. The solid-state fluorescence quantum yield of PM6PVPC18 is >8.9-fold higher than PM6PVPC1.
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目录:
  • Influence of alkoxy tail length on the properties of side chain liquid crystal polymers with aggregation–induced emission enhancement characteristics
    • Introduction
    • Experimental section
      • Materials
      • Measurements and characterizations
      • Synthetic method of monomers and polymers with different alkoxy tail length
        • Synthesis of 4-(dodecyloxy)benzaldehyde
        • Synthesis of (Z)-3-(4-(dodecyloxy)phenyl)-2-(4-hydroxyphenyl)acrylonitrile
        • Synthesis of (Z)-2-(4-((6-bromohexyl)oxy)phenyl)-3-(4-(dodecyloxy)phenyl)acrylonitrile
        • Synthesis of monomer M6PVPC12 (Z)-6-(4-(1-cyano-2-(4-(dodecyloxy)phenyl)vinyl)phenoxy)hexyl methacrylate
      • Preparation of polymers
    • Results and discussion
      • Synthesis and chemical structure characterizations of monomers and polymers
      • Thermal stability
      • Phase structure and phase transition behavior of monomers and polymers
      • Photophysical properties
    • Conclusion
    • Acknowledgements
    • References

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