서지주요정보
폴리 도메인 구조를 갖는 유방성 액정 고분자 용액의 복굴절 및 유변학적 특성에 관한 연구 = Rheo-optical and rheological behaviors of lyotropic polymer liquid crystals with polydomain structures
서명 / 저자 폴리 도메인 구조를 갖는 유방성 액정 고분자 용액의 복굴절 및 유변학적 특성에 관한 연구 = Rheo-optical and rheological behaviors of lyotropic polymer liquid crystals with polydomain structures / 김동학.
저자명 김동학 ; Kim, Dong-Hak
발행사항 [대전 : 한국과학기술원, 1993].
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소장정보

등록번호

8003464

소장위치/청구기호

학술문화관(문화관) 보존서고

DCHE 93016

SMS전송

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초록정보

Transient rheological behaviors of lyotropic polymer liquid crystals with polydomain structure have been investigated not only by two different experimental methods but also by Larson-Doi polydomain model. One of the experiments was the phase modulated flow birefringence technique, and the other was mechanical method involving both shear stress and dynamic modulus measurements. In case of either flow reversal or step changes in shear rates, the damped oscillatory responses of shear stress and birefringence were observed with similar periods. The periods were compared with those predicted by Larson-Doi polydomain model, which tells us that the period is only a function of the dimensionless concentration. It was shown that Larson-Doi theory can predict the global pictures fairly well but not the detailed transient behaviors by comparing the experimental result with the model predictions. To examine the quiescent domain structure both the shear stress relaxation modulus and dynamic moduli were measured. The quiescent polydomain structures of the lyotropic system can be easily destroyed by shearing and the critical strain of the destruction can be determined by measuring the stress relaxation after step strain. The most striking result of this study is that structure evolution during flow reversal may include the changes of both domain size and its orientation in an oscillatory manner. It can serve as a basic idea to build a more general kinetic theory on the polydomain lyotropic system.

서지기타정보

서지기타정보
청구기호 {DCHE 93016
형태사항 xiii, 141 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Dong-Hak Kim
지도교수의 한글표기 : 박오옥
지도교수의 영문표기 : O-Ok Park
학위논문 학위논문(박사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 123-129
주제 Stress relaxation.
Polymer colloids.
Polymer liquid crystals.
응력 완화. --과학기술용어시소러스
고분자. --과학기술용어시소러스
액정 고분자. --과학기술용어시소러스
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