초록문의 abstract@kcsnet.or.kr

결제문의 member@kcsnet.or.kr

현재 가능한 작업은 아래와 같습니다.
  • 08월 18일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Determination of molecular size and molecular weight distribution of butadiene rubbers using thermal field-flow fractionation coupled with multi-angle light scattering

2011년 8월 1일 16시 41분 44초
Ⅳ-ANAL.P-216 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
김선태, 이승호
한남대학교 화학과, Korea
In this study, thermal field-flow fractionation coupled online with a multi-angle light scattering (ThFFF/MALS) was used for characterization of microgel-containing butadiene rubbers (BR) showing different physical properties. They were cis-BR’s having relatively high content of cis form. In ThFFF operation, a field-programming was employed to optimize the separation of the sol and gel portion of BR, where the external field (temperature gradient, ΔT) was gradually decreased according to a power function during a run. The molecular weight and root-mean-square (RMS) radius of various BR molecules were determined by using berry method according to light scattering theory. It was found that the size distribution and content of the microgel play a critical role in the physical properties of BR’s. The molecular weight and the size distributions of the microgel particles were different for BR’s showing different physical properties. The ThFFF results were compared with those from size exclusion chromatography (SEC) and dynamic light scattering (DLS). For the samples tested in this study, SEC could not show the difference among various samples because, in SEC, the sample solutions were filtered before the injection, which removed the microgel particles. Keyword: Butadiene rubber (BR), Thermal field-flow fractionation (ThFFF), Multi-angle light scattering (MALS), molecular weight distribution (MWD), Microgel content, Size-exclusion chromatography (SEC), Dynamic light scattering (DLS)