Question

What is critical solution temperature .Explain with binary solvent system?

Answer 1

Answer:

Temperature-sensitive polymers demonstrate lower critical solution temperatures (LCST), which provide reversible low swelling at high temperatures and high swelling at low temperatures (Lee and Shim, 2001). When passing up the LCST, the polymer chains collapse and display intramolecular hydrophobic interactions. Intermolecular hydrophobic interactions of partly collapsed polymer chains enhance phase separation (Dubovik et al., 2005). Collapse of the macromolecules involves a large decrease or increase in permeability of the material, depending on its mode of preparation (Crespy and Rossi, 2007).