Synthesis And Modification Of The Janus Composite Materials Of The Compounds Contained Titanium, Manganese Or Boron/Polystyrene

Janus composite materials are regarded as some of the most complicated colloidal particles in existence. Janus particles are fabricated by two parts with different chemical components or micromorphology which endows Janus particles with different assembly behaviors and properties. Janus composite materials are applied as surfactants, biosensors, oriential catalysis, biological probe, electronic devices and photonic crystal and so on. However, it is difficult to synthesize Janus composites materials in batch and regulate the chemical structure. Emulsion swelling assisted protrusion holds promise to resolve the above problems.In this paper, the microspheres of sulfonated polystyrene (SPS) oringinated from polystyrene were coated with titanium dioxide (TiO2), urushiol-manganese (UMn) and poly (urushiol-borate) (PUB). The obtained core-shell composite microspheres of TiO2@SPS, UMn@SPS and PUB@SPS were swelled in organic solvent. As a result, the Janus composite particles of TiO2/poly (St-DVB), UMn/PS and PUB/PS were obtained by emulsion swelling assisted protrusion. The Janus composite materials could be functionlized further. For example, PANi/poly (St-DVB) was obtained by modifying at the knob of TiO2 with aniline. The morphology and chemical structure of the Janus composite materials were characterized by Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), infrared spectroscopy (IR), thermal gravimetric analysis (TGA), X-ray diffraction (XRD), ultraviolet spectrophotometer (UV) and elemental analysis, etc.The thickness of the sulfonic layers could be adjusted by changing sulfonated time, and then TiO2@SPS and UMn@SPS core-shell composite microspheres with different shell thickness were obtained. However, the sulfonic layers had little effect on tuning shell thickness of PUB@SPS. The Janus particles of TiO2/PS, UMn/PS and PUB/PS were prepared by emulsion swelling assisted protrusion the obtained core-shell composite microspheres in organic solvent. The proportion of the two knobs of Janus composite particles could be tuned by changing the dosage of solvent and the swelling time. The polarity and the solubility parameter of organic solvent were determinant for the swelling process. The PS core could be swelled out from the TiO2 shell smoothly, when the solubility parameter of organic solvent with low polarity was similar to PS core. The aniline could react with sulfonic group by in-situ oxidative polymerization on the surface of sulfonic layers after the removal of TiO2 of the TiO2 poly (St-DVB) Janus composite particles. The conductive property of PANi/poly (St-DVB) Janus composite particles increased obviously. The conductivity was 0.247 S/cm after redropping by p-toluenesulfonic acid. The Janus composite particles of UMn/PS and PUB/PS possessed the properties of natural raw lacquer and the anisotropy of Janus composite materials. This research could offer theory and experiment foundation for the application of natural polymer in Janus composite materials and offer new ideas for the application of natural polymer and Janus composite materials.