This paper presents a comparative study on the mechanical properties of seven monofilaments of 0.12 mm diameter made with different polymeric materials including PET, PBT, PE, PP, and PA6 in order to assess their suitability for being spacer yarns for developing high-quality spacer fabrics. Their support capability and elasticity corresponding to fabric compression resistance and resilience, respectively, were evaluated by analyzing the tensile stress–strain relationships and residual strains of monofilaments subjected to cyclic tensile loading. Slack and taut heat setting on the monofilaments were also considered to select a proper heat setting method for their spacer fabrics. The mechanical properties of the monofilaments were explained by using the supramolecular structure information from X-ray diffraction and sonic orientation tests. The results showed that PET monofilaments have much higher moduli than the other monofilaments and possess better support capability as spacer yarns for spacer fabrics. PET monofilaments also have better elasticity under small deformation below 5% strain than the other monofilaments, but their elasticity is inferior under large deformation above 5% strain. PET monofilaments are suitable for being spacer yarns to achieve high compression resistance and resilience for spacer fabrics. The PET monofilament with higher molecular weight possessed the lower Young’s modulus which is good for the knitting process. PET monofilaments with high molecular weight and taut heat setting are recommended for producing spacer fabrics with high compression resistance and resilience, especially for small fabric deformation.

中文翻译：

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高分子单丝力学性能的比较研究

本文对 PET、PBT、PE、PP 和 PA6 等不同聚合物材料制成的 7 种直径为 0.12 mm 的单丝的机械性能进行了比较研究，以评估它们作为间隔纱的适用性，以开发高质量的间隔织物. 通过分析承受循环拉伸载荷的单丝的拉伸应力-应变关系和残余应变，分别评估它们对应于织物抗压性和回弹力的支撑能力和弹性。单丝上的松弛和拉紧热定形也被认为是为其间隔织物选择合适的热定形方法。通过使用来自 X 射线衍射和声波取向测试的超分子结构信息来解释单丝的机械性能。结果表明，PET单丝比其他单丝具有更高的模量，并且作为间隔织物的间隔纱具有更好的支撑能力。PET单丝在5%应变以下的小变形下也比其他单丝具有更好的弹性，但在5%应变以上的大变形下其弹性较差。PET单丝适合作为间隔纱，以实现间隔织物的高抗压性和回弹性。分子量较高的 PET 单丝具有较低的杨氏模量，有利于针织工艺。推荐使用高分子量和热定型拉紧的PET单丝生产具有高抗压性和回弹性的间隔织物，特别是对于小变形织物。