Graphene-reinforced poly(vinyl alcohol) electrospun fibers as building blocks for high performance nanocomposites
Graphene-reinforced poly(vinyl alcohol) electrospun fibers as building blocks for high performance nanocomposites
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DOI：
10.1039/c5ra15689k
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
S. Ghobadi;Sina Sadighikia;M. Papila;F. Cebeci;S. A. Gürsel
中科院分区：
文献类型：
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作者：
S. Ghobadi;Sina Sadighikia;M. Papila;F. Cebeci;S. A. Gürsel
含有石墨烯的纤维结构对聚合物基质溶液具有高水平的亲和力，已被证明是有前途的高性能宏观纳米复合材料增强的目的。在这项研究中，首次成功地制备了共溶剂辅助的分散良好的热还原氧化石墨烯分散体。石墨烯溶液，然后进一步溶解在聚（乙烯醇）溶液和静电纺丝，分别产生中空纳米纤维，其中的关键性能，如溶液拉伸粘度和纤维的机械性能，进行了研究。采用聚焦离子束先进切割和截面技术，在双束仪上对初生纤维的中空度进行了全面的研究。通过扫描电子显微镜研究了还原的氧化石墨烯含量对经受张力的垫的单个纤维排列的影响。分析表明，在0.6wt%石墨烯含量的纺成毡中实现了最佳取向，其中与纯PVA纺成毡相比，杨氏模量提高了60%以上。发现上述现象是上级机械性能的原因。
Graphene-containing fibrous structures with a high level of affinity towards a polymer matrix solution have been proved to be promising for high performance macroscopic nanocomposite reinforcement purposes. In this study, for the first time, co-solvent assisted well-dispersed thermally reduced graphene oxide dispersions were successfully prepared. Graphene solutions were then further dissolved in poly(vinyl alcohol) solutions and electrospun, respectively, producing hollow nanofibers, for which key properties, such as solution extensional viscosity and fiber mechanical properties, were studied. The hollowness of the as-spun fibers were comprehensively investigated through a focused ion beam-based advanced cutting and cross-section technique in a dual beam instrument. The effect of reduced graphene oxide content on individual fiber alignment of mats subjected to tension forces was studied via scanning electron microscopy. The analysis revealed that the optimum alignment was achieved at 0.6 wt% graphene-content as-spun mats, in which the Young's modulus was improved by over 60% compared to the neat PVA as-spun mats. The mentioned phenomenon was found as responsible for superior mechanical properties.