Effects of post-draw processing on the structure and functional properties of electrospun PVDF-HFP nanofibers
Effects of post-draw processing on the structure and functional properties of electrospun PVDF-HFP nanofibers
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DOI：
10.1016/j.polymer.2019.03.017
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发表时间：
2019-05-08
期刊：
影响因子：
4.6
通讯作者：
Beachley, Vince Z.
中科院分区：
文献类型：
--
作者：
Conte, Adriano A.;Shirvani, Khosro;Beachley, Vince Z.
本研究报告的影响，后拉伸处理的静电纺丝聚（偏氟乙烯-共-六氟丙烯）（PVDF-HFP）纳米纤维的结构和功能特性。先前的研究已经独立地证明了静电纺丝工艺或后拉伸工艺分别增强PVDF膜和薄膜结构的压电性能的潜力。然而，后拉伸电纺纳米纤维一直难以实现。为了克服这一限制，实施了并行自动化轨道装置以每分钟后拉伸数千个单独的PVDF-HFP电纺纳米纤维。建立的关系表明，屈服强度，杨氏模量，和压电输出增强拉伸比的增加。与未拉伸的对照相比，拉伸至拉伸比为3的PVDF-HFP纳米纤维的归一化电压输出增加了四倍。我们假设，聚合物链和晶体排列在纤维轴的方向上，这是增加后拉伸，导致在机械刺激下的PVDF-HFP纳米纤维的电压输出增强。
This study reports the effects of post-draw processing on the structural and functional properties of electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofibers. Previous studies have independently demonstrated the potential of the electrospinning process or the post-drawing process to enhance the piezoelectric properties of PVDF nanofiber, and thin film structures respectively. However, post drawing electrospun nanofibers has been difficult to achieve. To overcome this limitation, a parallel automated track device was implemented to post-draw thousands of individual PVDF-HFP electrospun nanofibers per minute. Relationships were established showing that yield strength, Young's modulus, and piezoelectric output were enhanced with increasing draw ratio. The normalized voltage output of PVDF-HFP nanofibers post-drawn to a draw ratio of 3 increased by four-fold compared to undrawn control. We hypothesize that polymer chain and crystal alignment in the direction of the fiber axis, which were increased by post drawing, resulted in enhanced voltage output of PVDF-HFP nanofibers under mechanical stimulation.