Polyethylene (PE) is the most widely used thermoplastic resin in the world now. Among the endless number of PE products, films constitute over 50% of the consumer market and are applied in optical, packing and filtration areas according to distinct condensed structures. In this work, we prepared high-density polyethylene (HDPE)/liquid paraffin (LP) precursor films with various condensed structures by adjusting the LP content. Subsequently, we delved into the mechanism behind structural evolution during the uniaxial stretching process. Our findings reveal that an increase in LP content can increase the mobility of molecular chains, fostering the transformation of lamellae into an oriented microfiber structure during uniaxial stretching process. This improvement contributes to the enhanced stretchability of the films. Finally, we fabricated biaxially oriented membranes with distinct properties. These properties span from non-porous packaging films with exceptional optical characteristics to porous films suitable for specialized separation applications, achieved through the manipulation of the LP content. In summary, we manufacture different kinds of PE films through the strategy of “structure→ processing→ property”, which provides efficient access to design a given polymer material with desired structure and tunable properties via “structuring” processing.

中文翻译：

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通过“结构化”加工策略制造具有可调性能的双向拉伸高密度聚乙烯膜

聚乙烯（PE）是目前世界上应用最广泛的热塑性树脂。在数不胜数的PE产品中，薄膜占据了50%以上的消费市场，并以其独特的凝聚结构应用于光学、包装和过滤领域。在这项工作中，我们通过调整LP含量制备了具有各种缩合结构的高密度聚乙烯（HDPE）/液体石蜡（LP）前驱体薄膜。随后，我们深入研究了单轴拉伸过程中结构演化背后的机制。我们的研究结果表明，LP含量的增加可以增加分子链的流动性，促进片层在单轴拉伸过程中转变为定向微纤维结构。这种改进有助于增强薄膜的拉伸性。最后，我们制造了具有独特性能的双轴取向膜。这些特性涵盖从具有卓越光学特性的无孔包装薄膜到适合专门分离应用的多孔薄膜，这些薄膜是通过控制 LP 含量来实现的。综上所述，我们通过“结构→加工→性能”的策略制造不同种类的PE薄膜，这为通过“结构化”加工设计具有所需结构和可调性能的给定聚合物材料提供了有效的途径。