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Morphology, microstructure and mechanical properties of electrospun alumina nanofibers prepared using different polymer templates: A comparative study
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jallcom.2020.154502
Xiaolei Song , Kechao Zhang , Ying Song , Zhenxin Duan , Qiang Liu , Yang Liu

Abstract Alumina nanofibers with excellent mechanical properties are an ideal candidate as the reinforcements for composites. In this study, alumina nanofibers were fabricated via electrospinning technique combined with the sol–gel method. Alumina precursor sol was prepared using aluminum nitrate and aluminum isopropoxide. The morphology, microstructure, and mechanical properties of the nanofibers prepared using polyvinyl alcohol, polyvinyl butyral, and polyvinyl pyrrolidone as the polymer templates after calcination at 900 °C were investigated and compared. The three fiber samples exhibited continuous structure and the same phase composition of γ-Al2O3. However, the surface roughness, diameter distributions, densification degrees, crystallization temperatures, grain sizes, tensile strength, and elastic modulus were completely different. Possible mechanisms for these differences were discussed on the basic of the homogeneity of spinning solutions, the decomposition behaviors of polymers, and the quantities and sizes of defects and grains. The findings of this study can help in understanding an often-neglected concept on the important role of polymer categories on the structure and properties of electrospun oxide nanofibers, particularly required with enhanced mechanical properties.

中文翻译:

使用不同聚合物模板制备的电纺氧化铝纳米纤维的形态、微观结构和机械性能:比较研究

摘要 具有优异机械性能的氧化铝纳米纤维是复合材料的理想增强材料。在这项研究中,氧化铝纳米纤维是通过静电纺丝技术结合溶胶-凝胶法制备的。使用硝酸铝和异丙醇铝制备氧化铝前体溶胶。研究并比较了以聚乙烯醇、聚乙烯醇缩丁醛和聚乙烯吡咯烷酮为聚合物模板制备的纳米纤维在 900 °C 下煅烧后的形貌、微观结构和力学性能。三种纤维样品表现出连续的结构和相同的γ-Al2O3 相组成。然而,表面粗糙度、直径分布、致密化程度、结晶温度、晶粒尺寸、拉伸强度和弹性模量完全不同。在纺丝溶液的均匀性、聚合物的分解行为以及缺陷和晶粒的数量和大小的基础上讨论了这些差异的可能机制。这项研究的发现有助于理解一个经常被忽视的概念,即聚合物类别对电纺氧化物纳米纤维的结构和性能的重要作用,尤其是对增强机械性能的要求。
更新日期:2020-07-01
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