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首页> 外文会议>Technical Conference of the Society of Plastics Engineers >EFFECT OF NUCLEATING AGENT AND TWO-STAGE EXPANSION ON THE MORPHOLOGY AND MECHANICAL PROPERTIES OF MICROCELLULAR INJECTION MOLDED THERMOPLASTIC POLYURETHANE
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EFFECT OF NUCLEATING AGENT AND TWO-STAGE EXPANSION ON THE MORPHOLOGY AND MECHANICAL PROPERTIES OF MICROCELLULAR INJECTION MOLDED THERMOPLASTIC POLYURETHANE

机译：成核剂的影响和两阶段扩张对微孔注塑热塑性聚氨酯的形态和力学性能

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摘要

Improved rebound resilience while lowering bulk density is desirable in several sport-wear applications. While rebound resilience properties generally deteriorate with reduction of the bulk density of the foam, a method of increasing rebound resilience by improving the control on microstructure is explored in this study. Low density thermoplastic polyurethane (TPU)/clay nanocomposite foamed parts were prepared using twin-screw extrusion compounding followed by microcellular injection molding. Samples with two densities were created by microcellular injection molding and an optional cavity expansion at a preset time during cooling. Scanning electron microscopy, rheological analysis, uniaxial compression tests, and rebound resilience tests were conducted on both of the non-expanded and expanded samples. Presence of well dispersed nanoclay in the TPU matrix acting as a nucleating and melt strengthening agent, coupled with cell growth at lower temperature helped achieve better microstructures, especially at high density reductions. The expansion of TPU at lower temperatures with directional second-stage expansion also helped to increase the rebound resilience, while achieving softer foams and lower hysteresis loss ratios at lower densities.
机译：在几种运动磨损应用中，可以提高堆积密度的反弹弹性。虽然反弹弹性属性通常随着泡沫的堆积密度降低而劣化，但在本研究中探讨了通过改善微观结构对微观结构的控制来增加反弹弹性的方法。使用双螺杆挤出复合后，使用双螺杆挤出复合制备低密度热塑性聚氨酯（TPU）/粘土纳米复合材料泡沫零件。通过微孔注射成型和具有两个密度的样品通过微孔注射成型和在冷却期间预设时间的可选腔膨胀产生。在两种非膨胀和扩展的样品上进行扫描电子显微镜，流变分析，单轴压缩试验和反弹弹性测试。在TPU基质中存在良好分散的纳米粘土，作用为成核和熔融强化剂，耦合在较低温度下的细胞生长有助于实现更好的微观结构，尤其是高密度降低。 TPU在较低温度下具有定向第二阶段扩展的TPU的扩展也有助于增加反弹弹性，同时在较低密度下实现更柔软的泡沫和较低的滞后损失比率。

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