Abstract
The large lateral-sized graphene oxide (LGO) was successfully broken into medium- and small lateral-sized graphene oxide (MGO and SGO, respectively), using a self-designed tubular ultrasonic instrument and other different techniques such as centrifugation, ultrasonication, and freeze-drying. Nanocomposite fibers composed of polyester (PET) material modified with various lateral-sized graphene oxide (GO) were prepared by twin-rotor continuous extrusion and melt spinning. The effects of high-speed mixing and GO lateral size on the mechanical and thermal properties of the composite samples were investigated. Compared to the conventional twin-screw extruder, a twin-rotor continuous extruder achieves a more uniform distribution of GO in the PET matrix. Furthermore, the use of SGO yields the best dispersion and interfacial compatibility properties. It also promotes crystallization, which confirms that, compared to LGO and MGO, SGO plays a more important role in the heterogeneous nucleation of PET. Among the investigated samples, PET/SGO fibers loaded with 0.1 wt% SGO show the highest tensile strength (890 MPa) and Young's modulus (30 GPa). Therefore, the high-speed mixing of PET with nanometer-sized SGO using a twin-rotor continuous extruder has broad application prospects in the field of GO-reinforced polymers, on an industrial scale.
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