Precipitation of Polypropylene and Polyethylene Terephthalate Powders Using Green Solvents via Temperature and Antisolvent-Induced Phase Separation

Table 1

Hansen solubility parameters (HSP) for polyethyleneterephthalate (PET) and polypropylene (PP) and applied solvents.

	δD	δP	δH	REDPP	REDPET
Polypropylene	18	3	3
P-cymene	16.67	0.35	0	0.60	1.58
Dibutoxymethane	15.7	4	3.9	0.60	0.99
PET	18.2	6.4	6.6
Ethyl benzoate	17.9	6.2	6.0	0.55	0.11
γ-Valerolactone	16.9	11.5	6.3	1.17	0.94
Water	15.5	16.0	42.3	5.21	6.32
Ethanol	15.8	8.8	19.4	2.24	2.33
1-Hexanol	15.9	5.8	12.5	1.34	1.23

Note: The calculated relative energy differences (RED) for the solutes were calculated with an R₀ of 5.0 and 8.0 for PET and PP, respectively. All parameters were taken from Hansen [6].