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Configurational and Conformational Bending in Main-Chain Liquid Crystalline Polyesters

등록일
2009년 2월 8일 13시 27분 00초
접수번호
0136
발표코드
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발표시간
목 14시 : 40분
발표형식
심포지엄
발표분야
고분자화학 - Recent Researches on Nano-Scale Structures of Polymeric Materials Using Synchrotron Radiation Sources I
저자 및
공동저자
정광운
전북대학교 고분자.나노 공학과, Korea
Bent main-chain LC polyesters were synthesized from A-B type carboxylic acids. The phase behaviors and structures of these polyesters were characterized using DSC, WAXD, SAED and PLM. 1D WAXD results combined with DSC results revealed that odd-numbered polyesters enter a low-ordered LC phase before developing a crystalline phase while even-numbered polyesters exhibit a low-ordered LC phase and a highly ordered smectic crystal phase before developing a crystalline phase. Even though even-numbered polyesters retain the zigzag molecular arrangement in SmC which mimics the bent-core small molecules, chiral characteristics are not observed. On the other hand, odd-numbered polyesters are more or less parallel to each other along the chain. Therefore, it is concluded that the different structures were attributed to the interplay between the mesogenic group ordering propensity and the chain constraints dictated by the methylene spacer and the meta-linkage at the end of mesogen.

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