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Thermoplastic polyurethane (TPU) modifier to develop bimodal cell structure in polypropylene/TPU microcellular foam in presence of supercritical CO2
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2020-08-08 , DOI: 10.1002/vnl.21790 Jie Wang 1 , Jun Li 1 , Hui Li 1 , Hongfu Zhou 2
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2020-08-08 , DOI: 10.1002/vnl.21790 Jie Wang 1 , Jun Li 1 , Hui Li 1 , Hongfu Zhou 2
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Currently, the fabrication of microcell and bimodal cell structures (BCS) in polymer foams by using supercritical fluids has become a hot as well as a challenging research area worldwide. In this work, an environmentally friendly, effective, facile, and CO2‐based foaming technique was presented to fabricate microcellular polypropylene (PP) foams with BCS via blending with thermoplastic polyurethane (TPU). The toughness, thermal properties, rheological properties, and foamability of PP were systematically investigated with gradual incorporation of TPU. Representative sea‐island structure was observed in the scanning electron microscopy (SEM) images for the fracture surface of various PP/TPU samples. Rheological measurement results demonstrated that the viscoelasticity of various PP/TPU samples was improved remarkably compared with that of pure PP and pure TPU. The impact strength of various PP/TPU samples possessed the highest value as 12.4 kJ/m2 with the TPU content of 15 wt%. After the addition of TPU, an ameliorative cellular morphology was observed in the SEM micrographs of various PP/TPU samples and their volume expansion ratio was enhanced significantly thanks to their improved melt elasticity. Moreover, it is worth noting that BCS appeared in various PP/TPU foams when the TPU content exceeded 5 wt%.
中文翻译：
在超临界CO2存在下，热塑性聚氨酯（TPU）改性剂可在聚丙烯/ TPU微孔泡沫中形成双峰孔结构
当前，通过使用超临界流体在聚合物泡沫中制造微孔和双峰孔结构（BCS）已成为世界范围内的热点和挑战性研究领域。在这项工作中，环境友好，有效，轻便且CO 2提出了基于泡沫的技术，该技术可通过与热塑性聚氨酯（TPU）共混来制造带有BCS的微孔聚丙烯（PP）泡沫。随着TPU的逐渐加入，系统地研究了PP的韧性，热性能，流变性能和发泡性。在各种PP / TPU样品的断裂表面的扫描电子显微镜（SEM）图像中观察到代表性的海岛结构。流变测量结果表明，与纯PP和TPU相比，各种PP / TPU样品的粘弹性显着提高。各种PP / TPU样品的冲击强度最高，为12.4 kJ / m 2TPU含量为15 wt％。加入TPU后，在各种PP / TPU样品的SEM显微图中观察到了改善的细胞形态，由于其改进的熔体弹性，它们的体积膨胀比显着提高。此外，值得注意的是，当TPU含量超过5 wt％时，BCS出现在各种PP / TPU泡沫中。
更新日期：2020-08-08
中文翻译：
在超临界CO2存在下，热塑性聚氨酯（TPU）改性剂可在聚丙烯/ TPU微孔泡沫中形成双峰孔结构
当前，通过使用超临界流体在聚合物泡沫中制造微孔和双峰孔结构（BCS）已成为世界范围内的热点和挑战性研究领域。在这项工作中，环境友好，有效，轻便且CO 2提出了基于泡沫的技术，该技术可通过与热塑性聚氨酯（TPU）共混来制造带有BCS的微孔聚丙烯（PP）泡沫。随着TPU的逐渐加入，系统地研究了PP的韧性，热性能，流变性能和发泡性。在各种PP / TPU样品的断裂表面的扫描电子显微镜（SEM）图像中观察到代表性的海岛结构。流变测量结果表明，与纯PP和TPU相比，各种PP / TPU样品的粘弹性显着提高。各种PP / TPU样品的冲击强度最高，为12.4 kJ / m 2TPU含量为15 wt％。加入TPU后，在各种PP / TPU样品的SEM显微图中观察到了改善的细胞形态，由于其改进的熔体弹性，它们的体积膨胀比显着提高。此外，值得注意的是，当TPU含量超过5 wt％时，BCS出现在各种PP / TPU泡沫中。
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