Study On The Preparation And Method Of Linear Melt Secondary Differential Electrospun Nanofibers

When the fiber is close to or reaches the nanometer scale,it can show the special properties such as high specific surface area,excellent mechanical properties and flexibility,which are not possessed by many common size materials.It has been widely used in many fields.Because of the advantages of melt differential electrospinning,such as no solvent,low production cost,and many kinds of suitable materials.In this paper,melt differential electrospinning is the main choice in the process of fiber preparation and research.In this paper,the basic principle and process characteristics of melt electrospinning are introduced,and the domestic and foreign melt electrospinning devices and process characteristics are summarized.Then,the research of my team in melt differential electrospinning process,materials,equipment and promoting industrial production in recent years is introduced.In the end,some opinions on the research focus of melt electrospinning are put forward.Finally,on the basis of melt differentiation,the preparation method of linear melt secondary differential electrospun nano bicomponent fiber is proposed.The specific research contents are as follows:(1)The polypropylene(PP)/polylactic acid(PLA)coextrusion composite with a thickness of 1mm was successfully obtained by the micro nano lamination device developed by the laboratory based on differential lamination technology.In this paper,two kinds of polymer micro laminar composites are realized by using micro nano lamination device,one of which can be divided into four layers after one layer lamination device,and pass through six layers continuously.Therefore,the number of layers of composite material is 2*46=8192,and the thickness of single layer film has reached nanometer scale.In order to connect electrospinning,the first differential is achieved by using Wiener lamination method Subdifferentiation lays the foundation of research and experimental samples.(2)The PP and PLA bicomponent fibers were prepared by linear melt differential electrospinning equipment.The samples immerse in acetone aqueous solution to dissolve PLA components to obtain PP single component heteromorphic fibers.Then the PLA was added with Plasticizer Tributyl acetylcitrate(ATBC)for viscosity reduction to change the PLA melt flow rate(MFRs)and explore the difference of MFRs Different wrapping phenomenon.The results show that the difference of MFRs between the two components has a significant effect on the wrapping phenomenon of the two-component fiber,and it can be seen from the experiment that when PLA and PP with an ATBC content of ?=6wt%are co spun,the PP component shaped fiber with the best morphology can be obtained.(3)PP and different molecular weight polyethylene glycol(PEG)were dispersed and mixed evenly according to the set components.PP/PEG bicomponent fibers were prepared by using the melt differentiation technology and spinning system equipment developed by ourselves and the electric heating melting device.Polyethylene glycol has the properties of both fibrogenic and viscosity reducer.It can be used to prepare fibers with high fineness.The effects of different proportion of components,morphology of fibers at different spinning temperature and molecular weight of PEG on the final two-component fibers were investigated.To sum up,two-component fibers were successfully obtained through the above research,and heteromorphic single component fibers were obtained after post-treatment.