| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.458 |
| 발표분야 | 고분자 합성 |
| 제목 | Facile Synthesis of Hyperbranched Polyetherketones (PEKs) and Polyetheretherketones from A3 + B2 Monomers by Using Different Monomer Solubility in Reaction Medium |
| 초록 | Although hyperbranched polymers have been synthesized from A3 and B2 or A2 and B3 monomers,1 the approaches involve difficulty in controling polycondensation reaction due to premature gelation as described in Carother’s and statistical mechanics equations.2 Therefore, we are interested in optimization of polymerization condition to prepare hyperbranched polymers directly from commercially available A3 and B2 or A2 and B3 monomers. We have already proven the superior driving force on polycondensation of PEK monomers in PPA/P2O5 medium to yield high molecular weight linear and hyperbranched polymers.3 Electrophilic substitution reaction was taken placed even onto the electron deficient substrates such as C60 and vapor-grown carbon nanotube (VGCNT).4 Based on preliminary results on hyperbranched PEKs from A3 and B2 or A2 and B3 monomers approaches, using different solubility of monomers into the reaction medium, PPA/P2O5, could be the unique approach to control molecular weight and to prevent gelation. Since terephthalic acid (A2) and trimesic acid (A3) are hydrophilic relatively more soluble in the medium, diphenyl ether (B2) and 1,3,5-triphenoxybenzene (B3), on the other hand, are hydrophobic and phase separated from the reaction mixture. Thus, this paper is describing the important progress achieved on synthesis of hyperbranched polyetherketones (PEK’s) form A3 + B2 monomers by using Fridel-Craft acylation reaction in PPA/P2O5. In this approach, different solubilities of monomers in reaction medium was applied to bring down manufacturing cost and to take advantage of the easiness in controlling molecular weight and in preventing gelation. Furthermore, the reaction condition can also be extended to star block copolymer synthesis as well as to the materials for opto-electronic applications. References 1. (a) Jikei, M.; Chon, S. –H.; Kakimoto, M.; Kawauchi, S.; Imase, T.; Watanebe, J. Macromolecules 1999, 32, 2061; (b) Hao, J.; Jikei, M.; Kakimoto, M. Macromolecules 2002, 35, 5372; (c) Hao, J.; Jikei, M.; Kakimoto, M. Macromolecules 2003, 36, 3519. 2. (a) Carothers, W. H.; Hill, J. W. J. Am. Chem. Soc. 1933, 55, 5043; (b) Flory, P. J. J. Am. Chem. Soc. 1941, 63, 3083. 3. (a) Baek, J.-B.; Tan, L.-S. Polymer 2003, 44, 4135; (b) Baek, J.-B.; Lyons, C. B.; Tan, L.-S. Polym. Prepr. 2003, 44(1), 825; (c) Baek, J.-B.; Juhl, S. B.; Lyons, C. B.; Farmer, B. L.; Tan, L.-S. Polym. Prepr. 2002, 43(2), 1130; (d) Baek, J.-B.; Tan, L.-S. Polym. Prepr. 2002, 43(1), 514. (e) Baek, J.-B.; Tan, L.-S. Polym. Prepr. 2002, 43(1), 533. 4. (a) Baek, J.-B.; Lyons, C. B.; Tan, L.-S. J. Mater. Chem. 2004, 14, 2052; (b) Baek, J.-B.; Lyons, C. B.; Tan, L.-S. Polym. Prepr. 2003, 44(1), 925. |
| 저자 | 최자영1, 민정은1, Christopher B. Lyons2, Loon-Seng Tan3, 백종범4 |
| 소속 | 1충북대, 2Southwestern Ohio Council for Higher Education (SOCHE), 3Polymer Branch, 4US Air Force Research Lab (AFRL/MLBP) |
| 키워드 | Hyperbranched Polymer; Polyetherketone |
