서지주요정보
열방성 폴리에스터의 물성이 섬유방사의 신장비에 따라 폴리카보네이트 내에 형성된 폴리에스터 피브릴의 종횡비에 미치는 영향 = Effects of physical properties of thermotropic polyesters on the aspect ratio of the polyester fibril formed in polycarbonate for different draw ratios in fiber spinning
서명 / 저자 열방성 폴리에스터의 물성이 섬유방사의 신장비에 따라 폴리카보네이트 내에 형성된 폴리에스터 피브릴의 종횡비에 미치는 영향 = Effects of physical properties of thermotropic polyesters on the aspect ratio of the polyester fibril formed in polycarbonate for different draw ratios in fiber spinning / 윤종화.
저자명 윤종화 ; Yun, Jong-Hwa
발행사항 [대전 : 한국과학기술원, 1994].
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소장정보

등록번호

8004733

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 94017

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Polycarbonate (PC) was blended with a semiflexible thermotropic liquid crystalline polymer (STLCP) and polycarbonate (PC) or a commercial copolyester (Vectra A950). The STLCP was synthesized to have long flexible spacers in a main chain. Fiber spinning and drawing was carried out by an Instron Capillary Rheometer equipped with a take-up apparatus. Mechanical, rheological properties and morphology were investigated by using Instron tensile tester, Rheometrics Dynamic Spectrometer, scanning electron microscope. Tensile modulus of PC/STLCP blend increased with STLCP content, while that of PC/Vectra blend increased up to 10% and then dropped with content. The aspect ratio (L/D) of the fibers was also estimated by using the Halpin-Tsai equation. It was found out that the drawn fibers with high draw ratios contained numerous fine fibrils with nearly infinite aspect ratio, and the modulus increased linearly with STLCP volume fraction as expected. That is, the relationship between modulus and volume fraction obeyed the mixing rule for continuous fibril reinforcement. In the extrudates, the aspect ratio of PC/STLCP was larger than that of PC/Vectra. Deformation extent of the two blends during fiber spinning were compared through dimensionless parameters, the Weber number (We) and viscosity ratio, concerning with the deformation of dispersion phase. In order to obtain the We, interfacial tensions of the blends were calculated by Oldroyd model and compared them with the rheological data. The We of PC/STLCP was larger than that of PC/Vectra, but the viscosity ratio of the former was less than that of the latter. This was consistent with the results of aspect ratio estimated from Halpin-Tsai equation.

서지기타정보

서지기타정보
청구기호 {MCHE 94017
형태사항 viii, 61 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jong-Hwa Yun
지도교수의 한글표기 : 정인재
지도교수의 영문표기 : In-Jae Chung
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 58-61
주제 Polymers.
Matter-properties.
Polyesters.
고분자. --과학기술용어시소러스
기계적 성질. --과학기술용어시소러스
폴리에스테르. --과학기술용어시소러스
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