Synthesis And Modification Of The Janus Composite Materiais Based On The Compounds Contained Titanium, Iron/Poly-MPS

Polymeric microspheres have been received a great interest due to their unique properties and possibility for numerous potential applications, such as catalyst, self-assembly, photosensitive materials, solar cell, biological probe. Due to the isotropic nature of polymeric microspheres, there exist some restrictions in the application of oriental catalysis and oriental adsorption. Now researchers focus their attentions on anisotropic materials with asymmetric morphology and structure. However, it is difficult to synthesize Janus composites particles in large-scale production and to control their fine structure. Emulsion swelling assisted protrusion holds promise to resolve the mentioned difficulties.In this paper, the microspheres of sulfonated polystyrene (SPS) oringinated from polystyrene were coated with titanium dioxide (TiO2), urushiol-iron (UFe). The obtained core-shell composite microspheres of SPS@TiO2, SPS@UFe were swollen in organic solvent. As a result, the Janus composite particles of titaniumdioxide/3-(trimethoxysilyl) propylmethacrylate (Ti02/Poly-MPS), UFe/Poly-MPS Janus composite particles were obtained by emulsion swelling assisted protrusion. The Janus composite materials could be functionlized further. The phenolic resin (PF) was coated on the surface of Poly-MPS lobe. Finally, TiO2/C Janus composite particles were obtained by sintering at the atmosphere of nitrogen. The morphology and chemical structure of the Janus composite particles were characterized by Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), infrared spectroscopy (IR), thermal gravimetric analysis (TGA), ultraviolet spectrophotometer (UV) and elemental analysis, XPS, Raman spectrum, Specific surface area/pore size analysis (BET), etc.Results showed that the thickness of the sulfonic layers could be tuned by changing sulfonated time, and then SPS@TiO2 and SPS@UFe core-shell composite particles with different shell thickness were obtained. The Janus composite particles of TiO2/Poly-MPS, UFe/Poly-MPS Janus composite particles were prepared by emulsion swelling assisted protrusion in organic solvent. The proportion of the two knobs of anisotropic Janus composite particles could be tuned by changing the dosage of solvent, the swelling time, and the polymerization time. The polarity and the solubility parameter of organic solvent were determinant for the swelling process. The SPS core could be swelled out from the TiO2 shell smoothly when the solubility parameter of organic solvent with low polarity was similar to SPS core. The resulted materials of TiO2/C could be used in a variety of applications. Besides the oriental catalysis, the porous carbon lobe was beneficial for the photocatalytic activity of TiO2 lobe in the TiO2/C Janus composite particles, which was certified by the degradation of RhB. Therefore, the resulted Janus product exhibited better photocatalytic activity than TiO2 hollow microspheres. Such highly stable Janus porous materials of TiO2/C also held a great promise for asymmetric absorbing materials, asymmetric supporting materials used at high temperature, and so forth.The Janus composite particles of UFe/Poly-MPS possessed the unique properties of natural raw lacquer and the anisotropy of Janus composite materials. The UFe/Poly-MPS Janus composite particles were compartmentalized into two parts with different morphology. The anisotropic Janus composite particles of UFe/Poly-MPS would be expected to have application in functional materials ororiental coatings. This research could not only offer theory and experiment foundation for the application of natural polymer among Janus composite materials, but provide new ideas for the application of natural polymer and Janus composite materials.