Structures of Liquid-Crystalline Polyhedral Oligomeric Silsesquioxanes: A Monte Carlo Study

• Main Authors: Chun-Chia Hsu, 徐俊嘉
• Other Authors: 諶玉真
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/81689369630687801346

碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 93 === Liquid crystalline phases have properties which are intermediate between those of the fully ordered crystalline solid and isotropic liquid. The most important applications of liquid crystals will remain in the area of displays for the near future. Polyhedral oligomeric silsesquioxane (POSS) has discrete molecular structure which can be used as molecular scaffolding for liquid crystal systems. The attachment of liquid-crystal moieties to POSS forms a promising element which bears great potential to explore novel ways of controlling self-organization in liquid crystals. The structures of liquid-crystalline polyhedral oligomeric silsesquioxane (LC-POSS) are studied by continuous-space Monte Carlo simulations. Effects of temperature, volume fraction, number of side chain (arm number) and lengths of mesogen and spacer on the resulting mesomorphic properties are examined. The order parameter (S) and pair correlation functions in the directions parallel and perpendicular to the director, g//(r//) and g