Preparation Of A Polymer Microsphere Composite Functional Film

With the rapid development of nanotechnology,the research of biomimetic materials has entered the nano-and micro-scale,and has made creative achievements in the simulation of biological systems for the preparation of advanced functional materials.For instance,with different physicochemical properties and special polymer microspheres as filler to prepare the composite membrane with different functions has become a research hotspot in recent years.In this paper,polymer microspheres with special structure were designed by imitating the water retention mechanism of plant vacuoles and self-cleaning surface of lotus leaves,respectively,and then filling it into corresponding membrane substrates to prepare proton exchange membrane with good water retention capacity and superhydrophobic surface.And the properties of the composite membrane were analyzed by a series of characterization.The main contents of this paper are as follows:In the first chapter,the proton exchange membrane were introduced,and the research progress and development direction which based on the proton transmission mechanism were summarized.Then,the theory,preparation methods and potential applications of superhydrophobic surface were reviewed.In the second chapter,a kind of polymer microsphere with high water absorption core were designed by imitating the water retention mechanism of plant vacuoles,and then polymer microspheres were filled into the sulfonated poly(ether ether ketone)to prepare the composite membrane.There have superior internal cavity and hydrophilic functional groups in the core-shell microsphere,which could significantly improve the water uptake and water retention properties of the composite membrane and further enhance the proton conductivity of the composite membrane.In the third chapter,mimicking the surface micro/nanostructure of the lotus leaf,the hydrophobic PDVB microspheres were successfully filled into polyvinylidene fluoride(PVDF)by electrospinning to prepare the fiber membrane.The morphology and wettability of the fiber membrane were characterized by SEM and water contact angle.Finally,a superhydrophobic composite fiber membrane with water contact angle of 151.2°and water-roll angle of 8° was obtained.In the fourth chapter,the GMA and styrene monomers were introduced into the surface of polypropylene(PP)nonwoven fabric by UV irradiation grafting,firstly.Then,The self-assembly method was used to introduce the polymer microspheres with pyridine groups onto.PP surface to construct multiple structure.The results showed that the surface modification with GMA could reduced the hydrophobicity although it was beneficial to the formation of micro/nanostructure.When GMA and styrene were used together,the surface hydrophobicity of PP increased,but the formation of micro/nanostructure could be affected.The final water contact angle of the composite was up to 141.7°,which was significantly higher than that of the original PP.In the fifth chapter,the whole thesis contents were summarized and the potential application of the composite membrane were illustrated according to the results of the experiment.