| 초록 |
Self-coacervation is a liquid-liquid phase separation (LLPS) of a likely-charged single polyelectrolyte (PE) solution. Electrostatic repulsion of the PEs can be overcome by intermolecular interactions such as hydrogen bond (H-bond). In this study, we investigate salt- and temperature- induced LLPS of polyguanidinium in an aqueous solution because the guanidino groups (Gdm) can replace water molecules and then break hydration shell due to strong intermolecular H-bond. Gdm functionalized poly(allyl glycidyl ether)s (GPAGEs) were synthesized by anionic ring opening polymerization and post-modification. The phase behavior of GPAGE aqueous solution was characterized by transmittance, small-angle neutron scattering and light scattering measurements. Interestingly, the GPAGE solutions show upper critical solution temperature (UCST) phase behavior within mild temperature range (i.e., 0 – 100 ºC), and the transition temperature can be controlled by the ionic strength and the molecular weight. |
