Ionomeric polyester copolymer/organoclay nanocomposites, method of manufacture, and articles formed therefrom
A technology of organoclay and ionomer, applied in the field of nanocomposite materials, can solve the problems of poor performance, low crystallinity and water stability of nanocomposite materials
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[0101] Parts are parts by weight and temperatures are in degrees Celsius (° C.) unless indicated otherwise.
[0102] The materials used in these examples are listed in Table 1.
[0103] Table 1
[0104]
[0105] general method
[0106] The ingredients of the examples shown in Table 2 below were extruded in a 40mm Werner Pfleiderer twin-screw extruder equipped with an evacuated mixing screw, the temperature of the barrel and die was 240°C-265°C, the screw speed was 150-300rpm. The extruder has 8 separate feeders for different raw materials and can operate at a maximum rate of 136 kg / hr (300 lbs / hr). The extrudate was cooled by a water bath and then pelletized. The test parts were injection molded on a van Dorn molding machine with a temperature setting of about 240°C - 265°C. The pellets were dried in a forced air oven at 120°C for 3-4 hours before injection molding.
[0107] testing method
[0108] The tensile properties of the injection molded parts were tested acco...
Embodiment C1-C4
[0115] Examples C1-C4, E1-E2
[0116] Table 2 summarizes the tensile, impact and thermal properties of PBT nanoclay composites with and without hydropackage (ERL 4221 and sodium stearate). Comparing C3, C4 with C2, it is clear that the use of ionomer polymers resulted in exfoliation of the nanoclays, resulting in higher elongation at break (TE, break) and flexural modulus (FM) at the same time. Furthermore, comparing E1 and E2 with the comparative examples (C2, C3 and C4), it is evident that the use of water-stabilized components did not lead to a significant decrease in tensile properties (TS or TE) and that Izod unnotched impact (IUI ) performance and thermal performance are only slightly degraded. The flexural modulus (FM) of PBT ionomer nanocomposites using water stabilizing components was significantly improved compared to PBT alone (C1).
[0117] Table 2
[0118]
[0119] The above samples were tested for water stability in a pressure cooker at 110°C / 100% humidity....
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