Preparation And Properties Of Superhydrophobic PMMA-PS Thin Films Assisted By External Energy Field

Claustrophobic is a special wetting state on the surface of a material.The stable contact angle of the surface is greater than 150 °.The larger the surface contact angle,the better the superhydrophobicity of the film.Currently,it is widely used in fieldssuch as waterproofing,frost prevention,self cleaning,and corrosion prevention.Generally,the contact angle of superhydrophobic films prepared by scholars is within 160 °,which cannot achieve accurate transfer and manipulation of individual droplets in microfluidic devices,limiting the application of superhydrophobic films in related fields such as biological analysis and chemical purification.In order to prepare fiber films with better superhydrophobic properties,a novel process for preparing PMMA-PS superhydrophobic films by coupling ultrasonic vibration and magnetic field was developed based on vibration viscosity reduction theory and external energy field assisted filament formation technology.Firstly,using polymethyl methacrylate,polystyrene,and a small amount of silicondioxide as raw materials,a PMMA-PS fiber film with a spindle structure was successfully prepared using a process route of ultrasonic vibration magnetic field coupling assisted electrospinning.The micro morphology and properties of the hydrophobic thin films were observed and tested using SEM,FTIR,EDS,and contact angle measuring instruments.The results show that the PMMA-PS thin film prepared by coupling ultrasonic vibration and magnetic field has a better fiber refinement effect,a more compact arrangement of the spindle structure,a significant increase in the number of spindles,and an increase in the surface roughness of the film fibers.When using 15% PMMA solution and 15% PS solution as raw materials,the static contact angle of the prepared fiber film can reach 172.0°,It has excellent superhydrophobicity and has good application prospects in biological analysis,chemical purification,and other related fields.Due to the need for high-voltage static electricity in the electrospinning process,the preparation efficiency is low,which can cause safety hazards and is not conducive to achieving large-scale industrial production.Microfluidic spinning technology combines the advantages of microfluidic technology and spinning technology,eliminating the need for high-voltage static electricity,making it easier,faster,and safer to prepare fiber films,making it more conducive to achieving large-scale industrial production.In view of this,this article explores a process for preparing PMMA-PS superhydrophobic films by using ultrasonic vibration and magnetic field coupling assisted microfluidic spinning experiments.In this experiment,four microfluidic spinning experimental schemeswere designed,including conventional microfluidic spinning,magnetic field assisted,ultrasonic vibration assisted,and ultrasonic vibration magnetic field coupled assisted.Themicrofluidic spinning experiments were conducted on 20% concentration of polyacrylonitrile/dimethylformamide(PAN/DMF)spinning solution.The microstructure and morphology of the prepared fibers were analyzed using scanning electron microscopy.The results show that the fiber diameter ranges of conventional microfluidic spinning,magnetic field assisted,ultrasonic vibration assisted,and ultrasonic vibration magnetic field coupled assisted are 1.18-2.11 μ m,1.03-1.92 μ m,0.62-1.40μm,and 0.59-1.24μm,respectively;The variances were 0.159,0.096,0.053,0.048,respectively;Compared to conventional microfluidic spinning,the average diameter of fibers prepared by magnetic field assisted,ultrasonic vibration assisted,and ultrasonic vibration magnetic field coupling assisted methods decreased by 1.3%,28.7%,and 47%,respectively;Multi field couplingassisted preparation of fibers has the best refinement and uniformity,and the fiber surface is relatively smooth.