Abstract
Compatibility among chlorinated polyethylenes with different degrees of chlorination has been identified by the transparency of blended films cast from solvent. Dynamic mechanical measurements have been used to check these observations. The heats of mixing of pairs of chlorinated octadecanes with different degrees of chlorination have been measured and shown to be positive. It has been found that in this system, which is dominated by dispersion forces, compatibility is determined by similarity of the equation-of-state parameters. The Flory equation-of-state theory without the interaction entropy parameter Q 12 generates a positive ΔG m and hence fails to predict compatibility. A positive Q 12 is needed to remedy this deficiency of the theory. This is in direct contrast to the negative Q 12 which is introduced in the systems which are dominated by specific interactions.
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