http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 한규찬 (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
요오드화 알킬 존재하의 비닐아세테이트의 조절된 라디칼중합
마석일,남혜인,한규찬,권순홍,Mah, Souk-Il,Nam, Hye-In,Han, Kyu-Chan,Kwon, Soon-hong 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.5
Radical polymerization behaviors of vinyl acetate (VAc), initiated by N, N-azobisisobuty-ronitrile(AIBN) in the presence of several alkyl iodides(RI) such as chloroiodomethane(CIM), iodoform, and tridecafluorohexyliodide(TDFHI) have been investigated. Living natu.e, i.e., a fairly good agreement between the number average degree of polymerization of the resulting polymer (DP$_{n}$) and the theoretical value, determined by the molar ratio of VAc and RI, which is based on the assumption that one polymer molecule is formed by one molecule of RI. A linear relationship is observed between % conversion and DP$_{n}$ is observed when the molar ratio of AIBN/RI is kept at 2. The MWD of the resulting polymer decreases as % conversion increases. Polymers having narrow molecular weight distrbution (DP$_{n}$DP$_{n}$ <1.5) are obtained in the late. stage of polymerization. However, experimental DP$_{n}$ values show deviation from the theoretical values in the early stage of polymerization. This leads us to the conclusion that the living nature of the system is ascribable to the stabilization of the active propagating radical species by rapid iodine exchange with RI followed by the establishment of equilibrium between the active propagating radical species and polymer having a dormant carbon-iodine terminal group. The factors resulting in the loss of the living nature have also been discussed in conjunction with the results obtained from photo-induced polymerization.erization.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
