Design Of Electrospinning Equipment And Preparation Of Nanofibrous Membrane

Nanofibrous membranes are widely used in industries,such as water purification,anticorrosion seal and adsorption.Electrospinning is an effective way to prepare nanofibrous membranes.There are a lot of electrospinning equipment manufacturers in the global market,but the market in China is still far from saturated.Therefor,for those buyers who want to purchase an electrospinning equipment at a low price,there are not many options.In this thesis,a low-cost electrospinning equipment is designed,which can meet the requirements of laboratory level electrospinning research and small batch electrospinning production.The introduction of this equipment is divided into three parts,the mechanical design,the circuit design and the programming design.The part of mechanical design introduces the design of the main motion modules and the chassis.The part of circuit design introduces the selection of the electronic components,the selection and the layout of the SCM,the wiring of this equipment and the thermal simulation of the chassis.The part of programming design introduces the main code of the control program.Subsequently,the poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE))doped lead zirconate titanate piezoceramic(PZT)composite nanofibrous membranes were prepared by this equipment.Finally,the morphology,tensile properties,dielectric properties and piezoelectric properties of nanofibrous membranes with different mass fraction of lead zirconate titanate piezoceramic were studied.The results show that the electrospinning equipment designed in this paper can effectively prepare the composite nanofibrous membranes with good quality.For the morphology,the nanofibrous membrane with PZT mass fraction of 4%gave the best performance.The diameter of nanofibers prepared by electrospinning decreases with the increase of the conductivity of the spinning solution.Increasing the PZT mass fraction can increase the conductivity of the spinning solution,but high PZT mass fraction will lead to the uneven distribution of PZT powder particles in the nanofibers.In the tensile mechanical properties test,the nanofibrous membrane with PZT mass fraction of 4%is the best.With the increase of PZT mass fraction,the charge density of spinning solution increases,and the conductivity of the solution increases.As a result,the diameter of the nanofibers become smaller and the consistency of the diameter will be higher.,which means nanofibrous membrane can show better tensile mechanical properties.While the mass fraction of PZT continues to increase,the tensile strength and elongation at break of the nanofibrous membrane decrease.High PZT mass fraction leads to a large number of uneven distribution of PZT powder particles in the nanofibers,resulting in the decrease of the diameter consistency and increase of the hardness and brittleness of the nanofibrous membrane.The dielectric constant of the prepared nanofibrous membrane increases first,but then decreases with the increase of the mass fraction of PZT.When the PZT mass fraction rises from 0 to 2%,the dielectric constant of the nanofibrous membrane shows a small rise.There may be two reasons for this.First,the interfacial polarization between PZT and P(VDF-TrFE)occurs.Second,the dielectric constant of the nanofibrous membrane is improved due to the addition of high dielectric constant PZT.When the mass fraction of PZT continues to increase,the dielectric constant of the nanofibrous membrane decreases.The increase of PZT mass fraction makes the hardness of the nanofibers increase.Therefore,the nanofibers can bear more weight,raising the porosity of the nanofibrous membrane,resulting in the increasing of air content,and thus lowering the dielectric constant of nanofibrous membrane.The results of XRD scan show that the P(VDF-TrFE)doped PZT nanofibers prepared by this equipment have the characteristic wave peak of the ? phase,which means the nanofiberous membrane can show the piezoelectric effect.The intensity of the wave peak reachs the maximum value when the mass fraction of PZT reaches 0.It becomes not obvious after the PZT mass fraction rises to 4%,and the characteristic wave peak of PZT increases sharply.