Effect of the spin‐line temperature profile on the mechanical properties of melt electrospun polyethylene fibers
Effect of the spin‐line temperature profile on the mechanical properties of melt electrospun polyethylene fibers
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纺丝线温度分布对熔融电纺聚乙烯纤维机械性能的影响
DOI：
10.1002/app.50668
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发表时间：
2021
影响因子：
3
通讯作者：
Gorga, Russell E.
中科院分区：
文献类型：
--
作者：
Shabani, Elnaz;Gorga, Russell E.
covid-19 大流行揭示了对启动成本低的替代生产方法的需求，例如满足过滤需求的静电纺丝，这是个人防护装备 (PPE) 中最重要的要素。当前推进熔体静电纺丝的尝试涉及开发将纤维直径衰减到亚微米级的策略。在这里，纺丝区温度的调节（称为“纺丝线温度分布”）被用作纤维直径减小的基线。据报道，熔融电纺线性低密度聚乙烯（LLDPE）纤维的机械性能可以表征其相对于各种纺丝线温度分布的结构转变。随着圆锥形成区域纺丝线温度升高到 100°C 以上，拉伸强度和屈服强度增加，纤维直径减小四倍。观察到韧性显着增加，几乎增加了三倍，且不影响刚度和杨氏模量。动态力学分析表明，高温下的旋转会导致 α (α) 弛豫发生变化，从而导致断裂应变显着增加。这些结果意义重大，因为聚烯烃纤维是医用纺织品和个人防护装备的重要组成部分。因此，为熔体静电纺丝等新兴生产技术开发工艺-结构-性能的相关性变得至关重要。
The covid‐19 pandemic has revealed the need for alternative production approaches with low startup costs like electrospinning for filter needs, the most imperative element of the personal protective equipment (PPE). Current attempts in advancing melt electrospinning deal with developing strategies for fiber diameter attenuation toward sub‐micron scale. Here, the attunement in the spinning‐zone temperature known as ''spin‐line temperature profile'' was utilized as a baseline for fiber diameter reduction. The mechanical performance of the melt‐electrospun linear low‐density polyethylene (LLDPE) fibers is reported to characterize their structural transformation with respect to various spin‐line temperature profiles. With an increase in the spin‐line temperature to above 100°C in the area of cone formation, an increased tensile and yield strength along with fiber diameter reduction by four‐folds was demonstrated. A significant increase in toughness, by almost three times, without compromising the stiffness and Young's modulus was observed. The dynamic mechanical analysis revealed that spinning in high temperatures produces changes in the alpha (α) relaxation, contributing to the significant increase in strain at break. These results are significant because polyolefin fibers are an imperative element of medical textiles and PPE. Therefore, developing a correlation for process‐structure‐properties for emerging production techniques like melt electrospinning becomes critical.
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