Table 1 Solubilities of PE, EVOH, and PET in select solvent systems determined by HSPs (Ra/R0), COSMO-RS calculations, and experiments.

Ra/R0 is the ratio of the polymer-solvent distance to the interaction radius of the polymer (R0) in δD − δP − δH space. Ra/R0 less than unity means that the polymer is likely to dissolve in the solvent, whereas Ra/R0 greater than unity means that the polymer is insoluble in the solvent. ND indicates nondetected solubilities.

Component resinSolvent systemTemperature (°C)Ra/R0COSMO-RS solubility
(wt %)
Experimental
solubility (wt %)
PEToluene1100.3733.6214.56*
PEDMSO952.662.690.04
PE1:4 toluene:acetone251.311.57ND
PE1:4 DMSO:water255.530.00ND
EVOHToluene1102.000.270.00
EVOHDMSO951.0332.5414.05
EVOH1:4 toluene:acetone251.530.13ND
EVOH1:4 DMSO:water253.530.82ND
PETToluene1101.061.330.00
PETDMSO951.650.250.02
PET1:4 toluene:acetone250.910.00ND
PET1:4 DMSO:water254.800.00ND

*upper limit of PE wt% in toluene tested, as higher concentrations resulted in a viscous solution that was difficult to stir. This value therefore represents a lower limit for PE solubility in toluene at the temperature indicated.