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静电纺丝作为一种广泛采用的纳米纤维制备技术,影响其纤维形貌的主要因素包括材料参数、工艺参数和环境因素等.采用聚氧化乙烯(PEO)溶液,通过研究溶液属性(分子量、质量分数、电导率)和工艺参数(工艺电压、电极间距、喷嘴内径等)对纤维形貌的影响,得出相关参数对纤维直径和形貌的作用规律.研究结果表明:当PEO质量分数由4%到8%时,图案形貌经历了球状颗粒-珠丝共存-纤维的演变过程;分子量由40万到60万时,纤维由珠丝结构变成均匀光滑的丝,进一步增大分子量,纤维开始变得粗细不均并出现锯齿结构;当电导率由151到355 s/cm时,纤维直径变粗5倍;工艺电压(25~30 kV)增加,纤维直径先增加后减小,梭形颗粒先增多后减少;电极间距(15~25 cm)的增加使PEO纤维的直径减小,梭形颗粒先增加后减少;喷嘴内径由160 m增大到600 m时,纤维先是变得均匀光滑,后出现黏并结构.这些研究结果能够更好地指导静电纺丝技术在生物医用、纳米装置及纳米制造等领域的应用.
Electrospinning as one of the most widely used nanofiber preparation techniques, the main factors influencing the fiber morphology include material parameters, process parameters and environmental factors, etc. Polyethylene oxide (PEO) solution is used to study the properties of nanofibers by studying the properties of the solution (molecular weight, mass And the influence of process parameters (such as process voltage, electrode spacing and nozzle inner diameter) on the morphology of the fibers were investigated.The results show that when the mass fraction of PEO is from 4 % To 8%, the shape of the pattern undergone the evolution of spherical particles - coexistence of beads - the fiber from 400,000 to 600,000, the fiber from the bead structure into a uniform and smooth filament to further increase the molecular weight, fiber When the electrical conductivity increased from 151 to 355 s / cm, the fiber diameter became 5 times thicker. The process voltage (25-30 kV) increased and the fiber diameter increased at first and then decreased. The shape of the spindle When the nozzle diameter increased from 160 m to 600 m, the diameter of the PEO fiber became first and then decreased, while the diameter of the PEO fiber increased first and then decreased with the increase of the electrode spacing (15 ~ 25 cm) , Later sticky structure. These Study results to better guide the electrospinning technique in biomedical nanodevices, and nano manufacturing fields.