Electrospinning and post-drawn processing effects on the molecular organization and mechanical properties of polyacrylonitrile (PAN) nanofibers
Electrospinning and post-drawn processing effects on the molecular organization and mechanical properties of polyacrylonitrile (PAN) nanofibers
复制标题
DOI：
10.1557/mrc.2019.67
复制
发表时间：
2019-06-01
影响因子：
1.9
通讯作者：
Beachley, Vince Z.
中科院分区：
文献类型：
--
作者：
Brennan, David A.;Shirvani, Khosro;Beachley, Vince Z.
本文报道了静电纺丝后拉伸聚丙烯腈（PAN）纳米纤维的分子结构和力学性能。在没有后拉伸的情况下，聚合物链以六方晶体结构扭结和取向。在半固态下立即进行后拉伸破坏了晶体结构，并在最大拉伸比下发生链扭结。在最大拉伸下的结构重新取向导致杨氏模量增加500%和极限拉伸强度增加100%。通过将后拉伸应用于静电纺丝，可以获得与可用的制造技术相比具有增强的机械性能的PAN纤维和PAN衍生的碳纤维。
This paper reports the molecular organization and mechanical properties of electrospun, post-drawn polyacrylonitrile (PAN) nanofibers. Without post-drawing, the polymer chain was kinked and oriented in hexagonal crystalline structures. Immediate post-drawing in the semi-solid state disrupted the crystal structures and chain kink at maximum draw ratio. Structural re-orientation at maximum draw resulted in a 500% increase in Young's modulus and a 100% increase in ultimate tensile strength. By applying post-drawing to electrospinning it may be possible to obtain PAN fibers and PAN-derived carbon fibers with enhanced mechanical properties compared to available fabrication technologies.