Effects of bis(2-oxazoline) derivative as compatibilizer and reactive extrusion conditions
on the properties of polyamide 6/poly(ethylene terephthalate) blends
Polimery 2006, No 5, 351
The effects of reactive extrusion conditions [screw speed (n, 0.67-2.32s-1) and time (t, 60-360s)] 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, L/D=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 n values (Fig. 6, 7, and 9) was investigated and interpreted in details. Generally, t prolongation and n increase cause LL increase and accompanying decrease in MFR. Solubility decreases with prolonged t and increases with n 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.
Key words: reactive extrusion, conditions, polyamide 6 / poly(ethylene terephthalate) blends, 2,2-(1,3-phenylene)-bis(2-oxazoline), compatibilization, block copolymer, melt flow rate, solubility
Effects of bis(2-oxazoline) derivative as compatibilizer and reactive extrusion conditions on the properties of polyamide 6/poly(ethylene terephthalate) blends