研究目的
To develop organosoluble and transparent cardo polyimides with high Tg derived from 9,9-bis(4-aminophenyl)xanthene for applications in high-tech fields such as electro-optical devices, flexible display substrates, and semiconductor applications.
研究成果
The study successfully synthesized organosoluble and transparent cardo polyimides with high Tg, good thermal stability, and excellent mechanical properties. These PIs have potential applications in high-tech fields due to their low dielectric constants, high optical transparency, and low water uptake.
研究不足
The study focuses on the synthesis and characterization of PIs derived from BAPX and does not explore the application of these materials in specific devices or the scalability of the synthesis process.
1：Experimental Design and Method Selection
The study involved the synthesis of 9,9-bis(4-aminophenyl)xanthene (BAPX) via a one-pot, two-step procedure and its reaction with six aromatic dianhydrides to produce polyimides (PIs) through poly(amic acid) precursors followed by thermal or chemical imidization.
2：Sample Selection and Data Sources
Xanthenone and aniline were used as main substrates for the synthesis of BAPX. Six aromatic dianhydrides were selected for the polymerization process.
3：List of Experimental Equipment and Materials
Instruments included Bruker Avance 400 MHz spectrometer, Perkin-Elmer SP One FTIR spectrophotometer, Carlo Erba 1106 Elemental Analyzer, Waters 510 high performance liquid chromatography, Perkin-Elmer DSC-7 instrument, Perkin Elmer Pyris 1 TGA, Rigaku Geiger Flex D-Max III X-ray diffractometer, Instron 1122 testing instrument, TA Instruments DEA 2970 dielectric analyzer, and Shimadzu UV-1601 UV-vis spectrophotometer.
4：Experimental Procedures and Operational Workflow
The synthesis of BAPX involved refluxing xanthenone in thionyl chloride followed by reaction with aniline. The PIs were synthesized by reacting BAPX with aromatic dianhydrides in DMAc, followed by thermal or chemical imidization.
5：Data Analysis Methods
Characterization techniques included NMR, FTIR, elemental analysis, GPC, DSC, TGA, WAXD, mechanical testing, dielectric constant measurement, UV-vis spectroscopy, and water uptake measurement.
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Bruker Avance 400 MHz spectrometer
Avance 400 MHz
Bruker
Recording 1H and 13C NMR spectra
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Perkin-Elmer SP One FTIR spectrophotometer
SP One
Perkin-Elmer
Determining FTIR spectra of the monomer and polymers
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Perkin-Elmer DSC-7 instrument
DSC-7
Perkin-Elmer
Performing glass transition temperatures measurements
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Perkin Elmer Pyris 1 TGA
Pyris 1
Perkin Elmer
Determining thermal stability of the polymers
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Rigaku Geiger Flex D-Max III X-ray diffractometer
D-Max III
Rigaku
Recording wide-angle X-ray diffraction patterns
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Shimadzu UV-1601 UV-vis spectrophotometer
UV-1601
Shimadzu
Recording UV-vis spectra of the polymer films
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Carlo Erba 1106 Elemental Analyzer
1106
Carlo Erba
Performing microanalyses
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Waters 510 high performance liquid chromatography
510
Waters
Determining molecular weights by GPC
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Instron 1122 testing instrument
1122
Instron
Measuring mechanical properties of the polymer films
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TA Instruments DEA 2970 dielectric analyzer
DEA 2970
TA Instruments
Measuring dielectric constant
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