| 초록 |
Polymers with a lower critical solution temperature (LCST) undergo a phase separation upon heating from an one-phasic system to a bi-phasic system in which one phase has a high polymer concentration and the other one has a low polymer concentration. Most of the polymers exhibiting LCST behavior have coil-like chain conformation and normally work in water via hydrogen bond variation. In recent years, few examples of new LCST systems utilizing organic media have been reported, in which those LCST behaviors were induced by host-guest, charge-transfer, and hydrogen bonding interactions with additives. Although these demonstrations influence on broadening the scope for designing LCST polymers, they use ternary systems with various additives and are still illustrated with the polymers having coil-like conformation. In this study, we will present for the first time LCST behavior of rigid polymers in organic solutions and give a short account of the mechanism by using spectroscopic techniques. |
