| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 합성 |
| 제목 | Development of New catalyst for Atom Transfer Radical Polymerization |
| 초록 | Abstract Recently, extensive research has been carried out in the field of controlled / living radical polymerization (CRP). Among CRP, Cu-based atom transfer radical polymerization (ATRP) is one of the most powerful techniques in this field. There are many efficient homoatomic nitrogen-based ligands. We recently have synthesized furan and pyridinylhydrozone based ligands, 2-furancarboxaldehyde-2-pyridinylhydrazone (FPH) and 5-methyl-2-furancarboxaldehyde-2-pyridinylhydrazone (MFPH) to form ATRP catalysts with CuBr and studied their catalytic activity for the polymerization of methyl methacrylate (MMA: 50% solution, 900c) and styrene (St: bulk, 1100c). The new catalysts showed comparable polymerization rate and control in MMA polymerization with those of N,N,N',N'',N''-pentamethyldiethylenetriamine (PMDETA) based catalysts, the most widely used ATRP catalyst. In St polymerization, the new catalyst showed low activity and poor control over polymerization. Using 1-phenyl ethylbromide (PEBr) as a model compound for the polymeric chain ends, we measured the activation rate constants for new catalytic systems, which were about 300 times smaller than that of PMDETA based catalyst. The activation rate constants were determined using HPLC and GC under the kinetic isolation condition achieved by trapping the generated radical with 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO). Overall, it can be concluded that FPH and MFPH based heteroatom-catalysts showed promising catalytic activity for the polymerization of MMA and different trend of activity when compared with nitrogen based ATRP catalysts. |
| 저자 | 조홍열, 한병희, 김 일, 백현종 |
| 소속 | 부산대 |
| 키워드 | Atom Transfer Radical Polymerization; transition metal catalyst; styrene; methyl methacrylate; activation rate constant; heteroatom ligand |
