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  • 02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Unique monotropic phase transition behaviors of diphenylpyrimidine molecule

2015년 2월 11일 16시 24분 07초
POLY.O-6 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 11시 : 15분
고분자화학 - General Oral Presentation
저자 및
박민욱, 정광운1,*
전북대학교 고분자나노공학과, Korea
1전북대학교 고분자.나노 공학과, Korea
A butterfly-shaped diphenylpyrimidine molecule (DPP-6C12) was synthesized by covalently attaching two tridodecyl benzoate tails (6C12) at the both sides of the diphenylpyrimidine (DPP) moiety. Unique phase transition behaviors of DPP-6C12 and their origins were investigated with the combined techniques of thermal, scattering, spectroscopic, and microscopic analyses. On the basis of the experimental results and analyses, it was realized that a butterfly-shaped DPP-6C12 formed three ordered phases: a plastic crystal phase (PK), a crystal phase (K), and a liquid crystal phase (Φ). By breaking the molecular symmetry and coplanarity of DPP-6C12, peculiar monotropic phase transition behaviors were observed. The stable Φ mesophase was formed either by a slow heating above the metastable PK phase or by an isothermal annealing between TΦ and TK. The stable K phase was only formed by a slow heating from the preordered Φmesophase, and the formation of the K phase directly from the isotropic state (I) was forbidden because the nucleation barrier from I to K was too high to be overcome via thermal annealing. This work was supported by a grant from the Korea Institute of Science and Technology (KIST) Institutional Program (2Z04320), Basic Science Research Program (2013R1A1A2007238), SW Fusion Components R&D Program (MOTIE-10047806), BK21Plus Program, Korea