Research On The Preparation And Adsorption Performance Of Functional Polymer Microspheres Based On Microfluidic Technology

Nowadays,oil and heavy metal ion pollutions seriously endanger the ecological environment and human health,and seriously hinder the development of the society.Hence it is of great theoretical and practical significance to develop effective treating method for the pollution control of oil and heavy metal ions.In this work,three kinds of monodisperse functional polymeric microspheres are prepared by using microfluidic technology for the adsorption of oil and heavy metal ions.In chapter 2,one polymeric microspheres are prepared with methyl methacrylate(MMA)and styrene(St)as the comonomers,and ethylene glycol dimethacrylate(EGDMA),benzoin bisphenol ether(BDK)and polyglycerol polyricinoleate(PGPR)as the cross-linking agent,photo initiator and oil emulsifier,respectively.One highly monodispersed oil-in-water(O/W)emulsions are prepared by microfluidic technology at first.And then monodisperse polymer microspheres MMA/St are prepared under UV irridation with nanometer-sized pore structures utilizing water nanodrops fromed by H2O molecular across the O/W interface as porogen.The pore size and porosity of MMA/St can be adjusted by changing PGPR content.The morphology,porosity,particle size and monodispersity of microspheres are characterized.And the adsorption properties of microspheres for diesel oil are studied.In chapter 3,magnetic poly tripropylene glycol diacrylate(PTPGDA)microspheres have been proposed and successfully prepared by employing microfluidic emulsification and free radical polymerization.Firstly,oleic acid-modified nano-magnetic particles are generated by chemical co-precipitation and dispersed in MMA solvent to form magnetic fluid.Secondly,appropriate amount of magnetic fluid is added to tripropylene glycol diacrylate(TPGDA)which is used as the inner oil phase.BDK and PGPR are used as the photo initiator and oil emulsifier,respectively.Thirdly,the magnetic PTPGDA microspheres are fabricated by using O/W emulsions as templates.The magnetic properties of the microspheres are measured by vibrating sample magnetometer(VSM).And the chemical structure of the microspheres is analyzed by an infrared analyzer(FI-TR).The micro-morphology of the whole,surface,and cross section of the magnetic PTPGDA microspheres is analyzed by the scanning electron microscopy(SEM).The effect of PGPR content and pH changes on the contact angle of the microspheres is investigated.With the increase of PGPR content,the contact angle of the microspheres increases.And the hydrophobicity of the microspheres has good stability in strong acid or alkali conditions.The oil adsorption capacity of the PTPGDA microspheres are systematically studied,and the oil adsorption performance of the PTPGDA microspheres in strong acid or alkali solution is excellent.Further magnetic-guided separation and recycling of the oil-adsorbed PTPGDA microspheres can be achieved based on their magnetic-responsive property.The excellent adsorption capacity and good reusability for removal of oil from aqueous solution will make the PTPGDA microspheres attractive in the separation of water and oil.In Chapter 4,methyl methacrylate(MMA)and dimethylaminoethyl methacrylate(DMAEMA)are used as comonomers,and the MMA/DMAEMA copolymer microspheres are successfully designed and fabricated by using microfluidic technology.And the MMA/DMAEMA microspheres are used for the absorption of Cr(VI).The chemical composition and morphology are analyzed through the use of FI-TR and SEM,respectively.The effects of pH value,time and initial concentration on the adsorption of microspheres have been investigated.The kinetics and thermodynamics of the adsorption process are studied by using kinetic models and isothermal adsorption models.In summary,three kinds of monodisperse functional microspheres have been successfully prepared via microfluidic technology combined with free radical polymerization.And these microspheres have been applied in the fields of oil and heavy metal ions adsorption.It is provided a novel method for the preparation of functional microspheres and had broad application prospects in the treatment of water pollution.