Effects of Fiber Density and Strain Rate on the Mechanical Properties of Electrospun Polycaprolactone Nanofiber Mats
Effects of Fiber Density and Strain Rate on the Mechanical Properties of Electrospun Polycaprolactone Nanofiber Mats
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DOI：
10.3389/fchem.2020.00610
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发表时间：
2020-07-21
影响因子：
5.5
通讯作者：
Beachley, Vince Z.
中科院分区：
文献类型：
--
作者：
Conte, Adriano A.;Sun, Katie;Beachley, Vince Z.
本研究考察了电纺聚己内酯(PCL)纤维密度和应变速率对纳米纤维毡力学性能的影响。采用自动跟踪收集系统来控制每个毡的纤维数量，并促进均匀的单个纤维性能，而不考虑收集时间的长短。纤维密度与纳米纤维垫的力学性能相关。杨氏模量随着纤维密度的增加而减小，电纺30 S(717根纤维+/-345)的样品杨氏模量从14,901 Mpa下降到电纺40分钟(8,310根纤维+/-1,904)的3,615 Mpa。极限拉伸强度随纤维密度的增加而增加，S电纺30min的极限拉伸强度为594Mpa，电纺40min的极限拉伸强度为1250 Mpa。30分钟S组的平均韧性为0.239 GJ/m(3)，而40分钟时的韧性为0.515 GJ/m(3)。S电纺30min的极限拉应变为0.39，电纺40min的极限拉应变为0.48。随着纤维密度的增加，UTS、杨氏模数、韧性和极限拉伸应变之间的关系是纤维-纤维相互作用的结果，从而导致网络网状结构的相互作用。
This study examines the effects of electrospun polycaprolactone (PCL) fiber density and strain rate on nanofiber mat mechanical properties. An automated track collection system was employed to control fiber number per mat and promote uniform individual fiber properties regardless of the duration of collection. Fiber density is correlated to the mechanical properties of the nanofiber mats. Young's modulus was reduced as fiber density increased, from 14,901 MPa for samples electrospun for 30 s (717 fibers +/- 345) to 3,615 MPa for samples electrospun for 40 min (8,310 fibers +/- 1,904). Ultimate tensile strength (UTS) increased with increasing fiber density, where samples electrospun for 30 s resulted in a UTS of 594 MPa while samples electrospun for 40 min demonstrated a UTS of 1,250 MPa. An average toughness of 0.239 GJ/m(3)was seen in the 30 s group, whereas a toughness of 0.515 GJ/m(3)was observed at 40 min. The ultimate tensile strain for samples electrospun for 30 s was observed to be 0.39 and 0.48 for samples electrospun for 40 min. The relationships between UTS, Young's modulus, toughness, and ultimate tensile strain with increasing fiber density are the result of fiber-fiber interactions which leads to network mesh interactions.