서지주요정보
열교 차장 유동분리 방법에 의한 Polystyrene 의 열확산 매개변수 측정 = Measurement of thermal diffusion parameters of polystyrene using thermal field flow fractionation method
서명 / 저자 열교 차장 유동분리 방법에 의한 Polystyrene 의 열확산 매개변수 측정 = Measurement of thermal diffusion parameters of polystyrene using thermal field flow fractionation method / 송기창.
저자명 송기창 ; Song, Ki-Chang
발행사항 [서울 : 한국과학기술원, 1985].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4103092

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 8523

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Retention ratio and thermal diffusion parameters such as thermal diffusion factor and coefficient for polystyrene in toluene are examined by using Thermal Field Flow Fractionation(T.F.F.F) method. Retention ratio is reduced by increasing solute polystyrene molecular weight and channel temperature difference, and increased by increasing cold wall temperature and independent of solvent flow rate. These results are well interpreted by means of a theoretical calculation of the influence of both ordinary and thermal diffusions. Thermal diffusion factor is obtained from experimental value of retention ratio. Like the Ham's theory, thermal diffusion factor shows a marked temperature dependence proportional to the inverse of mean temperature of the channel and a polymer molecular weight dependence proportional to $(M.W)^0.553$. Using the equation for ordinary diffusion coefficient developed by Flory's method, thermal diffusion coefficient is calculated from the values of thermal diffusion factors. Themal diffusion coefficient is increased with molecular weight below 240,000 but constant above it. It is independent of concentration of polymer sample. Therefore, thermal diffusion coefficient cannot be responsible for the thermofractionation effect on polymers. On the other hand, ordinary diffusion coefficient, which is of pronounced dependence on the molecular weight, seems to be the governing factor for T.F.F.F.

서지기타정보

서지기타정보
청구기호 {MCE 8523
형태사항 [iv], 68 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Ki-Chang Song
지도교수의 한글표기 : 정인재
지도교수의 영문표기 : In-Jae Chung
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 63-65
주제 Thermal diffusivity.
확산. --과학기술용어시소러스
열 확산. --과학기술용어시소러스
Diffusion.
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