Solvents for Specific Polymers

Based on the properties and concepts introduced above (activity coefQcient, FH parameter, and solubility parameter), we summarize here the rules of thumb that have been proposed and extensively used in the literature for roughly selecting good solvents for specific polymers. 

A convenient practical measure of the intermolecular forces between polymer chains (hat might be used in selecting solvents for specific polymers is the solubility parameter. Solubility parameter 8 is related to the heat of vaporization, A//vap (cal/cm ), also a measure of the same intermolecular attractive force. The cohesive energy density c of a liquid is the energy needed to overcome intermolecular forces to separate the molecules from each other and is given by the expression... 

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