Synthesis of Novel Two Dimensional Covalent Organic Frameworks and Their Gas Adsorption/Desorption Properties

• Main Authors: Cheng-Han Kuo, 郭承翰
• Other Authors: Shiao-Wei Kuo
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7b77z2

碩士 === 國立中山大學 === 材料與光電科學學系研究所 === 106 === In this study, we synthesized a series of related monomers and polymers based on covalent organic frameworks (COFs) materials. In the first place, we prepared different five monomer derivatives, including TPA-3NH2, TPT-3NH2, TPA-3CHO, TPP-3CHO, and TPT-3CHO, which were characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. Secondly, we used the condensation polymerization to synthesize six different COFs via the Schiff base reaction to possess various two-dimensional crosslink structures, named TPA-TPA-COF (COF-1), TPA-TPP-COF (COF-2), TPA-TPT-COF (COF-3), TPT-TPA-COF (COF-4), TPT-TPP-COF (COF-5) and TPT-TPT-COF (COF-6), based on FTIR, TGA, solid state nuclear magnetic resonance (solid state NMR), elemental analysis (EA), powder X-ray diffractometer (PXRD), and BET analyses. The successfully synthesized of these COFs could be confirmed by using FTIR and solid state NMR analyses. All degradation temperatures of COFs are higher than 480 oC based on TGA analyses, indicating that the planar molecular for center group in the COFs make the structure having more stable and better thermal stability. The well-defined crystalline structures were observed of these COFs with hexagonal packed cylinder based on PXRD analyses. Finally, we utilized the surface area and pore size distribution to make further analyses about the relative N2(g) and CO2(g) sorption of different functional groups for center structures. We can observe that the capacity of carbon dioxide (CO2) capture was improved upon increasing the nitrogen content and planarity in COFs.