When we mix the solvent and polymer, we must break the solvent-solvent interaction, and break the polymer-polymer interaction, before forming a new solvent-polymer interaction, g 12. In the pure polymer before mixing, we have polymer-polymer interactions, which we will call g 22.
#Determine volume materials studio free#
In the pure solvent before mixing, we have solvent-solvent interactions, and let’s call the free energy of this interaction g 11. We are going to first make a “nearest neighbor” assumption, which is to say that we are going to neglect long range interactions and only consider the interactions between molecules that are closest to each other. Next, we will tackle the intermolecular interactions and their contribution to mixing. ( 1 m o l e c u l e o f p o l y m e r i s 962 t i m e s b i g g e r i n v o l u m e t h a n t h e s o l v e n t ) We need to find the degree of polymerization of the polystyrene so we can figure out the “volume” of the polymer in relation to the solvent: N 1 ( s o l v e n t ) = 10 g 92 g m o l = 0.109 m o l First, let’s solve for the number of moles of solvent and polymer: