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A qualitative study of question-posing anxiety in Chinese postgraduates in UK TESOL programs

  • Release time:2026-03-21
  • Hits:

  • DOI number: 

    10.1002/pol.20240924

  • Journal: 

    Journal of Polymer Science

  • Key Words: 

    Conjugated oligomers; Covalent triazine-based frameworks; Fluorenes; Microporous organic polymers

  • Abstract: 

    This study presents a systematic investigation into the synthesis, characterization, and potential applications of conjugated microporous materials (CMPs) constructed from fluorene-based monomers and covalent triazine linkages. By employing 9,9-diethyl-2,7-dicyanofluorene and 9,9,9′,9′-tetraethyl-7,7′-dinitrile-2,2′-bifluorene as key building blocks, a controlled polymerization process catalyzed by trifluoromethanesulfonic acid (CF3SO3H) was developed. Reaction conditions, including low-temperature and microwave-assisted protocols, were optimized to preserve the integrity of the triazine backbone while promoting the formation of a robust, highly crosslinked network. Structural features were confirmed via Fourier-transform infrared (FTIR) spectroscopy and elemental analysis, while thermogravimetric analysis (TGA) demonstrated exceptional thermal stability, with decomposition temperatures exceeding 460°C. The resulting CMPs exhibit high surface areas, tunable porosity, and excellent chemical robustness, positioning them as promising candidates for energy storage, gas adsorption, and catalysis. This work not only highlights the versatility of fluorene-based monomers in creating advanced microporous networks, but also establishes a foundation for future development of CMPs in next-generation optoelectronic and environmental applications.

  • Translation or Not: 

    no

  • Date of Publication: 

    2025-08-01

  • Included Journals: 

    SCI、EI
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