서지주요정보
Xanthan gum 용액의 광유변학적 성질에 관한 연구 = Rheo-optical study of xanthan gum solutions
서명 / 저자 Xanthan gum 용액의 광유변학적 성질에 관한 연구 = Rheo-optical study of xanthan gum solutions / 김동학.
저자명 김동학 ; Kim, Dong-Hak
발행사항 [서울 : 한국과학기술원, 1988].
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소장정보

등록번호

4105048

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 8807

SMS전송

도서상태

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초록정보

The PMFB apparatus which will allow time-dependent deformation and orientation of macromolecules in solutions to be deduced in a single experiment, was in our laboratory. As a sample, xanthan gum was used in this study. Steady state results are as follows. The birefringence exhibits a sharp increase at low velocity gradients and level off at higher shear rates. The measured orientation angle, on the other hand, drops quickly and then level off over the majority of the velocity gradient range. It was observed that the absolute value of the flow-induced birefringence is higher for the salted solution at low velocity gradients (SI). This may be an indication that the chains are more rigid in the presence of NaCl. Transient behaviors are as follows. At lower value of shear rate ($\gamma{'}=3 sec^{-1}$) Δn increases monotonically with time while at higher shear rates ($\gamma{'}=15sec^{-1}$ and up) an overshoot in Δn is detected. The overshoot increases with shear rate. When shear rate is $100sec^{-1}$, the %overshoot have a value of about 150. Such large overshoots can be explained by the fact that xanthan chains are not completely rigid. Using Haake viscometer, I measured viscosity and shear stress of xanthan gum solution of 400 ppm concentration. From these results, a stress-optical costant C was calculated. Its value was about $2.00\times 10^{-7}Pa^{-1}$.

서지기타정보

서지기타정보
청구기호 {MCE 8807
형태사항 iv, 71 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 1, 복굴절의 새로운 계산법. - 2, Turbo-basic program
저자명의 영문표기 : Dong-Hak Kim
지도교수의 한글표기 : 박오옥
지도교수의 영문표기 : O-Ok Park
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 59-60
주제 Deformations (Mechanics)
고분자 용액. --과학기술용어시소러스
변형 (기형) --과학기술용어시소러스
Polymer solutions.
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