Abstract
The effects of reactive extrusion conditions [screw speed (v, 0.67-2.32 s -1 ) and time (t, 60-360 s)] as well as concentration (0.2 or 0.4 wt. %) of compatibilizer [2,2-(1,3-phenylene)-bis(2--oxazoline), PBO] on selected properties of processed blends of polyamide 6 (PA6, 80 wt. %) and poly(ethylene terephthalate) (PET, 20 wt. %) were investigated. The process is carried out in a twin-screw extruder (D = 25 mm, LID = 33) at temperature of plasticizing system equal 245 °C. Dependence of melt flow rate (MFR), viscosity number (LL) and solubility (R) in 85 % formic acid (selective solvent for PA 6) on t (Fig. 1,2 and 4) and v values (Fig. 6, 7, and 9) was investigated and interpreted in details. Generally, t prolongation and v increase cause LL increase and accompanying decrease in MFR. Solubility decreases with prolonged t and increases with v increase. Ambiguous effect of PBO concentration complicates the course of this dependence. FT-IR results and selective solubility estimation proved that block copolymer PA6-block-PBO-block-PET [equation (1)] formed during the process investigated.
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