目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
绪论1
1 材料与方法3
材料 3
主要试剂3
主要仪器3
1.2 方法 3
1.2.1 溶剂体系对静电纺丝PU多孔纳米纤维的影响及性能表征3
1.2.2 纺丝工艺参数对电纺PU多孔结构纳米纤维的影响4
2 结果与分析5
2.1 溶剂体系对静电纺丝PU多孔纳米纤维的影响及性能表征5
2.1.1 纤维形貌分析5
2.1.2 纤维孔隙率分析8
2.1.3 纤维疏水性分析8
2.2 纺丝工艺参数对电纺PU多孔结构纳米纤维的影响9
2.2.1 纺丝流量对多孔结构纳米纤维的影响9
2.2.2 纺丝电压对多孔结构纳米纤维的影响9
2.2.3 纺丝接收距离对多孔结构纳米纤维的影响10
3 讨论 11
3.1 溶剂体系对静电纺丝PU多孔纳米纤维的影响及性能表征11
3.2 纺丝工艺参数对电纺PU多孔结构纳米纤维的影响12
4 展望 13
致谢13
参考文献15
静电纺丝制备聚氨酯（PU）多孔纳米纤维
摘 要
近年来，静电纺丝法制备的具有多孔结构的纳米纤维热度日渐上升，多孔结构的形成可以增大纳米纤维的比表面积，增强纳米纤维的疏水性，赋予其新的优异性能，使其更好地发挥纤维材料在生物医学等各领域中的作用。本研究选用一种被誉为“第五大塑料”的新兴有机高分子材料——聚氨酯（PU），采用静电纺丝技术，通过调控聚合物溶剂体系、纺丝工艺参数来制备具有多孔结构的纳米纤维，得到可控制备电纺PU多孔纳米纤维的条件，为其生产和应用提供参考依据。本文首先研究溶剂体系对制得的纳米纤维形貌和多孔结构的影响，并对制得的纳米纤维进行相应表征分析，研究表明不同溶剂配比会改变纤维形貌，在混合溶剂N，N二甲基甲酰胺（DMF）和丙酮、甲醇（MeOH）体积比分别为33/67、3/1时可以制备出具有多孔结构且形貌良好的PU纳米纤维。接着，研究纺丝工艺参 *51今日免费论文网|www.jxszl.com +Q: @351916072@ 
数对多孔结构纳米纤维形貌的影响，通过调节纺丝流量、纺丝电压和纺丝接收距离确定最优的电纺条件，结果表明纺丝工艺参数在PU纳米纤维的可控制备方面具有指导意义。
PREPARATION OF POLYURETHANE (PU) POROUS NANOFIBERS BY ELECTROSPINNING
ABSTRACT
In recent years, the heat of nanofibers with a porous structure prepared by electrospinning has been increasing day by day. The formation of the porous structure can increase the specific surface area of the nanofibers, enhance their hydrophobicity, and give them new excellent properties, making them better to play the role of fiber materials in various fields such as biomedicine. In this study, a new organic polymer material known as "the fifth largest plastic"polyurethane (PU), using electrostatic spinning technology, by adjusting the polymer solvent system, spinning process parameters to prepare a porous structure nanofibers can be controlled by the conditions of electroporated PU porous nanofibers, which can provide reference for their production and application. In this paper, we first study the effect of the solvent system on the morphology and porous structure of the prepared nanofibers, and perform corresponding characterization analysis on the prepared nanofibers. The research showed that different solvent ratios could change the fiber morphology. When the volume ratio of dimethylformamide (DMF), acetone and methanol (MeOH) was 33/67 and 3/1, respectively, PU nanofibers with porous structure and good morphology could be prepared. Next, the effect of spinning process parameters on the morphology of the porous nanofibers was studied. The optimal electrospinning conditions were determined by adjusting the spinning flow rate, spinning voltage and spinning receiving distance. The results showed that the spinning process parameters had guiding significance for the controllable preparation of PU nanofibers.

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