The Structure Dependent Physical and Rheological Properties of The Mesophase Pitches
- Title
- The Structure Dependent Physical and Rheological Properties of The Mesophase Pitches
- Other Titles
- 메조페이즈 피치의 구조적 차이에 따른 물리적 • 유변학적 특성
- Author
- 이승원
- Alternative Author(s)
- 이승원
- Advisor(s)
- 김병철
- Issue Date
- 2014-02
- Publisher
- 한양대학교
- Degree
- Master
- Abstract
- The effects of the structural characteristics of mesophase pitches on the rheological and physical properties were investigated in terms of temperature and shear. M-AR, polymerized from naphthalene with the HF/BF3 catalyst, was naphthenic and methylene-rich structure and T-MP, thermally condensed from coal tar, was aromatic structure. T-MP gave higher intensity ratio of D-band to G-band than M-AR in Raman analysis. Liquid crystalline morphology of M-AR was marbled texture and that of T-MP was schlieren texture. Shear initially applied to the pitches promoted the formation of the liquid crystalline domain. Molecular unstacking of M-AR proceeded gradually whereas that of T-MP occurred abruptly at particular temperature with increasing temperature in wide angle X-ray diffraction. Differential scanning calorimetry detected the molecular unstacking of T-MP near 350oC. M-AR and T-MP in nematic phase became biphase and isotropic phase in dynamic viscosity curves, respectively. The apparent viscosity curves followed the Onogi and Asada curve, which was proposed for liquid crystalline polymers.
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/131278http://hanyang.dcollection.net/common/orgView/200000423428
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Theses (Master)
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