The thermodynamic and kinetic phenomena involved in the formation
of sub-micron polyimide particles from polyimide/solvent/nonsolvent
ternary systems were studied. A quantitative equilibrium approach was
considered in the B-bonding studies of these ternary systems. The effect
of H-bonding on the physical properties and phase behavior of the
ternary systems was investigated. The critical requirements for the
control of polymer particle size and size distribution during particle
formation by precipitation from solution are discussed.
It was found that the equilibrium constants, enthalpies and
entropies of H-bonding in the ternary systems containing water can be
obtained by analysis of the lH_NMR data. Using the calculated
equilibrium constants, the determination of the concentration of H-bonds
between N-methylpyrrolidinone (NHP) and water is possible. We found a
very good correlation between the B-bond concentrations and the
deviations of the specific volume and viscosity from ideal mixing in the
NHP/water mixtures.
next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
![[VT]](http://scholar.lib.vt.edu/images/ETD-db/restricted.gif)
