| 초록 |
Many potential applications for dendritic polymers have been proposed. The behavior of dendritic polymer as a host is essential if they are to find success as solubilizing agents, nanoscale catalyst and drug delivery and slow release agents for perfumes, herbicides and drugs. Research is also active in applications as diverse as polymer additives, catalyst supports, thin films, laser-printing toners and Magnetic Resonance Imaging (MRI) contrast agents. Despite the wealth of possible applications, there is little study on the thermodynamic properties of solutions containing dendritic polymers.Recently, Freed et al. have developed a systematic expansion of the partition function of lattice polymer using well-known lattice cluster theory (LCT). This model takes into account the effect of branching on the thermodynamic properties of polymer solutions. Lue and Prausnitz applied the LCT to obtain solvent activities and liquid-liquid equilibria for homogeneous-dendritic polymers.In this study, we investigated liquid-liquid equilibria of hyperbranched polymer solutions. The experimental technique to determine the cloud points of the systems was Thermo-Optical Analysis (TOA) technique. To predict phase behaviors of the systems, we modified the LCT model to account for strongly interacting components by employing the concept of the generalized lattice fluid (LF) model.
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