| 초록 |
Phase behaviors of nematic liquid crystals (EBBA (P-ethoxy-benzylidene-p-n-butylaniline) and MBBA (P-methoxy-benzylidene-p-n-butylaniline)) in linear polystyrene ( PS ) are investigated by thermo-optical analysis ( TOA ) technique. We modify interaction parameter, , to take into account both polymer concentration and temperature and develop a new model by combining Ballauff’s model with the extended Flory-Huggins model. The model used in this work includes two adjustable model parameters (, ). Results are compared with the proposed model. We proposed an improved thermodynamic model based on the extended Flory-Huggins theory to describe the phase behavior of nematic liquid crystal/linear PS systems. The model gives slightly better agreement with experimental data than that of Dorgan’s. It might be that we do not take into account all interactions that exist in the given systems, especially specific interactions between molecules. It is likely that the deficiency is basically responsible for the discrepancy between the proposed model and experimental data.
|
