CHEM 4214 Lecture Notes - Lecture 21: Size-Exclusion Chromatography, Virial Coefficient, Ideal Gas Law
Document Summary
Polymer + solvent, when n --> large, if , then get small tc. Light scattering (friday) size exclusion chromatography (after spring break) Osmotic pressure determine mn, solvent quality (chi) for gel thermodynamics (model free) container with semi-permeable membrane that separate 2 liquids. Chem4212 polymers page 1 pure solvent solution contains large polymers that coil up we have driving force of solvent going through membrane but we have pressure of polymers (hydrostatic pressure) pi = osmotic pressure. At equilibrium: subscript means pure solvent no o means solution x1 = molar fraction of solvent x2 = 1 - x1. 2 is polymer, 1 is solvent assume very dilute --> do taylor expansion. Ideal gas law: pv = nrt dilute polymer in solution is similar to ideal gas (low pressure) c = concentration of polymer in g/ml. B = 2nd virial coefficient some people write it as. Comments: measure m & b from osmotic pressure plot.
