| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.470 |
| 발표분야 | 고분자 합성 |
| 제목 | Stabilization of Chain End of Poly(n-hexyl isocyanate) through Qunatitative End-capping Reaction In presence of catalyst. |
| 초록 | Poly (n–hexyl isocyanate)( PHIC ) has received considerable attention due to its unique properties 1,2 . We recently achieved the living anionic polymerization of isocyanates with sodium naphthalenide as an initiator using additives such as 15-crown-5 3 and sodium tetraphenyl borate. 4 However, the synthesized polymer generally undergoes depolymerization due to backbiting reaction between the chain end (-NH) and the carbonyl group. In order to improve the chemical stabilization of PHIC chain end, many researchers have employed various end-capping agents, 5-7 but efficiency as such reactions are low. In this study, anionic living chain end of PHIC was end-capped with acyl chloride derivatives in the presence of a catalyst that efficiently improved chemical stability (Fig. 1.). In addition, a facile route to introducing functionality at the chain end could also be achieved. The efficiency of end-capping reaction was nearly 100 %. Depending on the end-capping agents, macromonomer from vinyl end-capping agent or PHIC with preferred helix structure from chiral end-capping agents could be obtained and characterized. Fig. 1. Synthetic scheme of end- capped PHIC References [1] Mark M. Green, Norman C. Peterson, Science 1995, 268, 1860. [2] Muller, M; Zentel, R. Macromolecules 1994, 27, 4404. [3] Lee, J.-S.; Ryu, S.-W.; Macromolecules 1999, 32, 2085. [4] Shin, Y.-D.; Kim, S.-Y.; Ahn, J.-H.; Lee, J.-S. Macromolecules 2001, 34, 2408. [5] Patten, T. E; Novak, B. M. J. Am. Chem. Soc. 1996, 118, 1906. [6] Ute, K.; Asai, T.; Fukunishi, Y.; Hatada, K. Polym. J. 1995, 27, 445. [7] Se, K.; Aoyama, K.; Aoyama, J.; Donkai, M. Macromolecules 2003, 36, 5878. |
| 저자 | 정찬희, 이재석 |
| 소속 | 광주과학기술원 신소재공학과 |
| 키워드 | Ena-capping; Stabilization |
