| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 합성 |
| 제목 | Induction of chirality in helical poly(n-hexyl isocyanate) by end-capping with chiral acid chlorides |
| 초록 | Poly(n-hexyl isocyante) (PHIC) synthesized by living anionic polymerization using sodium benzanilide initiator has been successfully end-capped using aliphatic acyl chloride in presence of pyridine as the catalyst. The efficiency of end-capping turned out to be nearly 100% . PHIC adopts a helical structure in solution with both P (left handed) and M (right handed) helix . Green and co-workers induced optical activity into achiral-polymers by introducing minor chiral monomer units by “Seargent and Soldier’s Principle” , , . In the present study induction of optical activity by end-capping PHIC with chiral materials was studied. Induction of chirality in PHIC was effected by end-capping with chiral (R and S) 2-bromo-3-methylbutyryl chloride. Polymers with different molecular weights were synthesized to study the effect on optical activity by changing the molecular weights as well as temperature. In this paper details of chirality induction in PHIC from circular dichroism studies will be presented. References 1. Ahn, J.-H; Shin, Y.-D.; G. Y. Nath, Park, S.-Y.; Rahman, M. S.; Samal, S.; Lee, J.-S. J. Am. Chem. Soc. 2005, 127, 4132. 2. Lifson, S.; Green, M. M.; Andreola, C.; Peterson, N. C. J. Am. Chem. Soc. 1989, 111, 8850. 3. Gu, H.; Nakamura, Y.; Sato, T.; Teramoto, A.; Green, M.M.; Jha, S. K.; Andreola, C.; Reidy, M. P. Macromolecules 1998, 31, 6362. 4. Muller, M.; Zentel, R. Macromolecules 1996, 29, 1609. 5. Hoke II, S.; cooks, R. G.; Green, M. M. Macromolecules 1995, 28, 2955. |
| 저자 | 요겐드라 나스1, 박상윤1, 김형진1, Murthy. C.N.2, Samal. S.3, 이재석1 |
| 소속 | 1광주과학기술원, 2The M.S. Univ. Baroda, 3India |
| 키워드 | end-capping; chiral; anionic polymerization; hexyl isocyanate |
