การสังเคราะห์พอลิฟีนิลีนเอไทนิลีนโดยใช้แพลเลเดียมที่ตรึงบนแคลเซียมคาร์บอเนตเป็นตัวเร่งปฏิกิริยาแบบวิวิธพันธุ์
Our research focus on the development of the synthesis of poly(p-phenyleneethynylene) s (PPEs) from palladium supported on calcium carbonate as heterogeneous catalyst via the Sonogashira coupling reaction. The optimum condition of this reaction is using a diisopropylamine as a base and dimethylforma...
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| 格式: | Senior Project |
| 語言: | Thai |
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จุฬาลงกรณ์มหาวิทยาลัย
2015
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| 主題: | |
| 在線閱讀: | https://digiverse.chula.ac.th/Info/item/dc:9946 |
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| 總結: | Our research focus on the development of the synthesis of poly(p-phenyleneethynylene) s (PPEs) from palladium supported on calcium carbonate as heterogeneous catalyst via the Sonogashira coupling reaction. The optimum condition of this reaction is using a diisopropylamine as a base and dimethylformamide as a solvent at 80 °C. After precipitation with methanol, PPEs are successfully prepared in excellent yield (99%). The Gel Permeation Chromatography (GPC) data indicates that an average molecular weight (MW) is 24,185 while degree of polymerization (DP) and polydispersity index (PDI) are 53 and 2.7 respectively. Inductively coupled plasma optical emission spectrometer (ICP-OES) measurement reveals that leaching of palladium into PPEs are 0.3%w/w. When compare these data with the conventional homogeneous catalyst, PdCl₂(PPh₃)₂, it indicates that our PPEs show better properties in term of DP, PDI and leaching of palladium. |
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