Synthesis Of Janus Particles And Compatibilizing Behavior

Janus particles?JPs? with two different compositions thus properties compartmentalized onto the two corresponding sides, are promising as solid surfactants, catalyst carriers, optical probes, drug deliveries, and micro-reactors. In particular, JPs with biphasic brushes covalently attached onto their surface may show multiple properties associated with the particle core and compatibility with their corresponding polymers due to the brushes. Thus this kind of particles are potential in compatibilizer of polymer blends to generate excellent properties of polymer blend marterials.In this paper, Janus particles with biphasic grafted rubber brushes PISiO₂@PDVB-PBd have been firstly fabricated by successively grafting PBd chains onto PDVB side and PI chains onto SiO₂ side mainly through “grafting to” method accomplied with anionic polymerization and “click chemistry” in the case of SiO₂@PDVB Janus particles as the template. FTIR, EDX and TGA are used to analyse the change of chemical group and grafting ratios. TEM is used to analyse the change of mophology before and after grafting. An obvious shell of PI and PBd are seen in the final product through TEM. The TGA results also indicate the successful grafting of PBd and PI chain.SiO₂@PDVB and PI-SiO₂@PDVB particles are respectively blend with polystyrene/isoprene rubber?PS/IR? blend through solution blending. The phase seperation morphology and particle dispersion are observed by phase contrast microscope. The result shows that both particles are dispersed mainly in the PS phase, and can lead to the retardation of phase separation.PI-SiO₂@PDVB-PBd particles are blend with polyisoprene/polybutadiene?PI/PBd? blend through solution blending. The phase seperation morphology and particle dispersion are observed by phase contrast microscope. The particles are jammed at the interphase, and size of phase seperation decreases with increasing concentration of this particles, which shows this kind of particles a good compatibilizer to PI/PBd blend. And the model of rubber blend jammed by neutral wetting particles at interface is firstly proposed.