LOW-TEMPERATURE EXTRUSION IN TECHNOLOGY OF POLYETHYLENE TEREPHTALATE/ CLAY NANCOMPOSITES
Abstract
Characteristic features of the structure and mechanical properties of nanocomposites based on polyethylene terephtalate (PET) and layered clay silicates (LCS) were studied. Na+-montmorillonite (not treated) and organoclay Cloisite 30B were used as LCS. The materials were compounded by means of the extrusion technology using a twin-screw extruder (the diameter of screws was equal to 35 mm, L / D = 40. The temperature of the main compounding zones was above the PET melting temperature for melt extrusion, and ≈50 °С and ≈100 °С below that temperature for low-temperature extrusion. It was found that the change from the regime of melt extrusion to that of low-temperature extrusion promoted the increase in the deformation-strength properties of the PET/clay nanocomposites. The X-ray diffraction analysis showed that the degree of nanoclay intercalation in the PET matrix increased with changing to the low-temperature extrusion regimes. The nanoclays appeared to cause a nucleating effect on the PET crystallization; this effect became stronger with higher degrees of polymer overcooling in the material cylinder of the extruder.
About the Authors
S. S. PESETSKII
V. A. Belyi Metal-Polymer Research Institute of the National Academy of Sciences of Belarus, Minsk
Belarus
Belarus
S. P. BOGDANOVICH
V. A. Belyi Metal-Polymer Research Institute of the National Academy of Sciences of Belarus, Minsk
Belarus
Belarus
V. N. ADERIKHA
V. A. Belyi Metal-Polymer Research Institute of the National Academy of Sciences of Belarus, Minsk
Belarus
Belarus
V. N. KOVAL
V. A. Belyi Metal-Polymer Research Institute of the National Academy of Sciences of Belarus, Minsk
Belarus
Belarus
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