서지주요정보
열방성 액정 폴리에스터-등방성 중합체 블랜드의 유변학적 성질 = Rheological properties of thermotropic polyester-isotropic polymer blends
서명 / 저자 열방성 액정 폴리에스터-등방성 중합체 블랜드의 유변학적 성질 = Rheological properties of thermotropic polyester-isotropic polymer blends / 김연철.
저자명 김연철 ; Kim, Youn-Cheol
발행사항 [대전 : 한국과학기술원, 1991].
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소장정보

등록번호

8002231

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 9103

SMS전송

도서상태

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초록정보

Thermotropic liquid crystalline polyesters($LCP_s$) were prepared by melt polymerization and they have flexible spacers(-(-$CH_2-)-_{6.10}$) inserted between mesogen units. Their thermal properties as well as mesophasic behaviors were investigated by using differential scanning calorimetry and polarizing microscope. They had nematic mesophase between melting and isotropic transition temperature. Their rheological properties of nematic melts were measured with rheometric dynamic spectrometer at low shear rate and capillary rheometer at high shear rate. The dynamic data of the liquid crystalline homopolymer and copolymer showed that LCP melts were different from flexible chain polymers in a sense of having a quite long relaxation time, strongly shear thinning and apparent yield stress at low frequency. In their blends with isotropic polymers(PET, PA-6), the spherical or ellipsoidal domains of LCP in the matrix were formed and deformed to fibrous structure by the elongational flow. The melt viscosities of the blends measured by capillary rheometer were significantly reduced since the oriented liquid crystalline domain lubricated the melt. Especially, in a high shear rate the viscosity was sharply decreased between 10 and 30wt% of LCP. Also, the morphological changes of LCP domain in the matrix polymer according to various shear rates and blend ratios were investigated by using scanning electron microscopy. We could observe the deformed structure of LCP domain. In a high shear rate the change to fibrous structure of LCP domain occurred between 10 and 30wt% of LCP supported the viscosity behavior which was sharply decreased near the blend ratio.

서지기타정보

서지기타정보
청구기호 {MCE 9103
형태사항 [viii], 73 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Youn-Cheol Kim
지도교수의 한글표기 : 정인재
지도교수의 영문표기 : In-Jae Chung
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 69-72
주제 Polymers.
Liquid crystals.
물리적 성질. --과학기술용어시소러스
고분자. --과학기술용어시소러스
액정. --과학기술용어시소러스
Rheology.
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