서지주요정보
열방성 액정 폴리에스테르이미드 공중합체의 합성 및 물성에 대한 연구 = Synthesis and physical properties of thermotropic liquid crystalline copoly(ester-imide)s
서명 / 저자 열방성 액정 폴리에스테르이미드 공중합체의 합성 및 물성에 대한 연구 = Synthesis and physical properties of thermotropic liquid crystalline copoly(ester-imide)s / 김상욱.
저자명 김상욱 ; Kim, Sang-Ouk
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8006559

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 96004

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초록정보

A series of thermotropic liquid crystalline copoly(ester-imide)s, which formed nematic phase, were synthesized from 2,6-diacetoxy naphthalene and the varying amount of the two n-(ω-carboxyalkylene) trimellitic imides. They had the lower crystal-nematic transiton temperatures and relatively slower crystallization rate than homopoly(ester-imide)s. It seemed that structural irregularity due to the random monomeric sequence made the crystallization of these copolymers difficult. A qualitative explanation of the hysterisis of TLCPs required significant amounts of identical monomer sequences to initiate crystallization upon cooling. Consequently, the viscoelastic properties of homopolymers showed the strong dependence of the crystallization rate and residual crystallites in the nematic phase of which the origin is the relatively regular monomeric sequence in polymer chain. Copoly(ester-imide)s with irregular monomeric sequence showed little effect of thermal history because these copolymers had a very low degree of the crystallinity and the rate of crystallization was very slow so that almost all portion of the nematic phase was kept after solidification process. Fibers were spun from copoly(ester-imide) as a function of draw ratio at its melting temperature. It also contained no crystallite and its molecular orientation and mechnical properties increase very rapidly with draw ratios.

서지기타정보

서지기타정보
청구기호 {MCHE 96004
형태사항 vii, 76 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sang-Ouk Kim
지도교수의 한글표기 : 정인재
지도교수의 영문표기 : In-Jae Chung
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 73-75
주제 불규칙 단량체 순서
결정화
히스테레시스
Random Monomeric Sequence
Crystallization
Hysteresis
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