Due to its simple linear chain structure, crystal morphology of linear low‐density polyethylene (LLDPE) fibers can be controlled to fulfill the needs of diverse advanced applications. This study presents a simple two‐step method to produce LLDPE fibers with self‐assembled fibrillar crystals and highly oriented amorphous phase. Rather than conventional melt spinning, fibers were treated in a two‐step eco‐friendly bath without drawing after extruded fibers emerge from the spinneret. Treated fibers through the baths demonstrated lower crystallinity, but significantly higher degree of crystal orientation when compared to control fibers of traditional melt spinning. Morphological analysis revealed that a unique microstructure was formed after spinning through a two‐step eco‐friendly bath. As‐spun fibers demonstrated spherulitic morphology which can be transformed into a fibrillar structure followed by post‐drawing process. Cross sectional images of the treated LLDPE fibers produced at 400 m/min showed fibrillar PE crystals which can be more dominant upon post‐drawing. After two‐step bath treatment, produced fibers need low draw ratios to exhibit high performance. Our novel modification followed by hot drawing process can manipulate internal structure with performance of PE fibers to an outstanding level of 0.35 GPa strength and 3 GPa modulus at a production speed of 400 m/min.

中文翻译：

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具有可调节特性的自组装纤维状聚乙烯晶体

由于其简单的线性链结构，可以控制线性低密度聚乙烯（LLDPE）纤维的晶体形态，以满足各种高级应用的需求。这项研究提出了一种简单的两步法来生产具有自组装原纤维晶体和高度取向的非晶相的LLDPE纤维。与传统的熔体纺丝不同，在挤出的纤维从喷丝头中出来后，纤维经过两步环保洗池处理而没有拉丝。与传统熔体纺丝的控制纤维相比，经过浴液处理的纤维表现出较低的结晶度，但晶体取向度明显更高。形态分析表明，通过两步式环保浴旋转后形成了独特的微观结构。初生纤维表现出球状形态，可以转变为原纤维结构，随后进行拉伸后加工。以400 m / min的速度生产的经过处理的LLDPE纤维的横截面图像显示出原纤维状的PE晶体，该晶体在拉伸后可能占主导地位。经过两步浴处理后，生产出的纤维需要低拉伸比才能表现出高性能。我们的新技术经过热拉伸工艺之后，可以以400 m / min的生产速度将具有PE纤维性能的内部结构控制到0.35 GPa强度和3 GPa模量的出色水平。生产的纤维需要低拉伸比才能表现出高性能。我们的新技术经过热拉伸工艺之后，可以以400 m / min的生产速度将具有PE纤维性能的内部结构控制到0.35 GPa强度和3 GPa模量的出色水平。生产的纤维需要低拉伸比才能表现出高性能。我们的新技术经过热拉伸工艺之后，可以以400 m / min的生产速度将具有PE纤维性能的内部结构控制到0.35 GPa强度和3 GPa模量的出色水平。