通过基质强度调节和氮气引入控制超临界CO2发泡TPU系统的协同收缩

IF 4.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL
Huazhen Jiang, Panfeng Shao, Xia Liao
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引用次数: 0

摘要

热塑性聚氨酯(TPU)泡沫塑料具有弹性好、抗冲击强度高、耐低温等优异性能,广泛应用于鞋类、医疗、汽车、包装、运输、航空航天等领域。然而,超临界二氧化碳(CO2)制备的TPU泡沫具有明显的收缩率,限制了其广泛应用。本研究以有利于高膨胀比的低硬度TPU为基体,通过掺入高硬度TPU调节硬度和结晶度、混合发泡剂发泡或N2再发泡两种方法制备TPU泡沫。结果表明,通过调节TPU泡沫的硬度和结晶度,可以抑制TPU泡沫的收缩行为。此外,与混合发泡剂相比,用N2再发泡可显著提高最终膨胀率。结果表明,先用CO2发泡后再用N₂发泡的TPU泡沫,不仅最终膨胀比约为11倍,而且具有最佳的弹性和较高的抗压强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synergistic shrinkage control in supercritical CO2 foamed TPU systems via matrix strength modulation and nitrogen introduction
Thermoplastic polyurethane (TPU) foam has been applied widely in footwear, medical treatment, automotive, packaging, transportation, aerospace, etc. due to excellent properties such as elasticity, high impact strength, low temperature resistance. However, the significant shrinkage of TPU foam prepared by supercritical carbon dioxide (CO2) imposes a limitation on its wider application. In this study, TPU with a low hardness which is favorable for high expansion ratio was used as the matrix and TPU foams prepared by two approaches was investigated: regulating hardness and crystallinity by incorporating high hardness TPU, as well as, foaming with mixture blowing agents or re-foaming with N2. The results showed that the shrinkage behavior of TPU foam could be inhibited by regulating its hardness and crystallinity behavior. Furthermore, the final expansion ratio was improved significantly by re-foaming with N2 in comparison to foaming with mixture blowing agent. It was ascertained that TPU foams first foamed with CO2 and re-foamed with N₂ not only is optimal for achieving a final expansion ratio of approximately 11 times but also achieving the best elasticity and high compressive strength.
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来源期刊
Journal of Supercritical Fluids
Journal of Supercritical Fluids 工程技术-工程:化工
CiteScore
7.60
自引率
10.30%
发文量
236
审稿时长
56 days
期刊介绍: The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.
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