서지주요정보
분자량 분포를 갖는 PMMA 와 n-butylchloride 용액의 임계 상 분리 온도에 관한 연구 = Upper and lower consolute solution temperatures of polydispersed PMMA-n-butylchloride solutions
서명 / 저자 분자량 분포를 갖는 PMMA 와 n-butylchloride 용액의 임계 상 분리 온도에 관한 연구 = Upper and lower consolute solution temperatures of polydispersed PMMA-n-butylchloride solutions / 이형오.
저자명 이형오 ; Lee, Heung-Oh
발행사항 [서울 : 한국과학기술원, 1986].
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소장정보

등록번호

4103614

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 8623

SMS전송

도서상태

이용가능

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반납예정일

초록정보

The cloud point curves of upper and lower consolute solution temperatures have been determined for polydispered polymethyl methacrylate (PMMA) solutions of n-butyl chloride and characterized in terms of entropic parameters of Flory-Huggins' theroy. Depending on the rate of heating or cooling processes, the clouding points of the atactic polydispersed PMMA - n-butyl chloride solutions, determined by the visible light absorption, vary abruptly near the extremum points. The equilibrium curves were approximated from the clouding points of zero rate by extrapolation. The equilibrium curves of the upper consolute polymer solutions having different molecular weights, shift to lower temperature regions as molecular weight decreases, while the lower consolute points appears at higher temperature. Further the shapes of phase boundaries near the consolute solution points become flattened and scattered at both temperature regions. The polymer solutions with bimodal molecular weight distribution were also found to have the small curvatures near the extrimum points, representing the influence of the polydispersity. Near the consolute solution points, the effect of polydispersity was characterized with the use of the Flory-Huggins' entropic parameters from the clouding point curves. Compared with the polymer solutions of the unimodal distribution, the PMMA solutions with the bimodal distribution have a large increase in entropic parameter, representing the entropic effect of size dissimilarity.

서지기타정보

서지기타정보
청구기호 {MCE 8623
형태사항 [iv], 54 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : A, Flory 상태 방정식. - B, NMR Spectra. - C, GPC. - D, 실험데이타
저자명의 영문표기 : Heung-Oh Lee
지도교수의 한글표기 : 김종득
지도교수의 영문표기 : Jong-Duk Kim
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 42-44
주제 Phase transmission (Statistical physics)
고분자 용액. --과학기술용어시소러스
상전이. --과학기술용어시소러스
Polymer solutions.
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