研究目的
To synthesize bio-based polyamides with high transparency and low yellowness by introducing fluorine side chains, and to evaluate their thermal, optical, and water repellency properties.
研究成果
Fluorinated bio-based polyamides were successfully synthesized with improved transparency and reduced yellowness while maintaining high heat resistance (over 250°C). The introduction of fluorine side chains suppressed charge transfer interactions, enhancing optical properties. However, water repellency was not notably increased. These materials show potential as alternatives to conventional transparent plastics like poly(methyl methacrylate) and polycarbonate.
研究不足
The films of PA-F1 and PA-F2 were brittle, preventing measurement of mechanical properties. Water repellency was not significantly improved despite fluorination. Molecular weights were relative due to GPC interactions with fluorine atoms. PA-F1d showed high yellowness due to side reactions.
1：Experimental Design and Method Selection:
The study involved synthesizing fluorinated dicarboxylic acid monomers (ATA-F1 and ATA-F2) from 4-aminocinnamic acid, followed by polymerization with various aromatic diamines using triphenyl phosphite and pyridine in N-methyl-2-pyrrolidone (NMP) at 100°C under nitrogen atmosphere. The design aimed to improve transparency and reduce yellowness in bio-based polyamides.
2：Sample Selection and Data Sources:
Monomers were purchased from Tokyo Chemical Industry Co., LTD, FUJIFILM Wako Pure Chemical Corporation, and Kanto Chemical Co., Inc. Some monomers (e.g., 4,4'-diamino-α-truxillic acid) were synthesized based on previous research.
3：List of Experimental Equipment and Materials:
Equipment included NMR spectrometers (Bruker Bio-spin AG 400 MHz and 100 MHz), GPC system (Shodex column, GL Science components, JASCO pump and detectors), ESI-FT-ICR MS (Bruker Solarix-JA), TGA (HITACHI STA 7200), DSC (SEIKO X-DSC7000T), UV-Vis spectrometer (JASCO V-670), and contact angle meter (Drop-Master DM 300). Materials included various chemicals for synthesis and solvents.
4：0). Materials included various chemicals for synthesis and solvents.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synthesis steps involved reactions under specific conditions (e.g., UV irradiation for photodimerization, addition of reagents at controlled temperatures), followed by purification (filtration, evaporation, recrystallization). Polymerization was carried out in NMP with heating, and films were cast from DMF solutions for characterization.
5：Data Analysis Methods:
Structural analysis via NMR, molecular weight determination by GPC using polystyrene standards, thermal analysis by TGA and DSC, optical properties by UV-Vis spectroscopy, and contact angle measurements.
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