Foaming of thermoplastic polyurethane using supercritical CO2 AND N2: Antishrinking strategy

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-05-13 DOI:10.1016/j.supflu.2024.106311

P. Belmonte , M. Céspedes , M.J. Ramos , J.F. Rodríguez , I. Garrido , M.T. García , J.M. García-Vargas

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Abstract

The transformation of thermoplastic polyurethanes into polymeric foams is attracting great interest nowadays. However, this technology has some challenges that it is necessary to resolve, being one of the most important the shrinkage suffered by the polymeric foams over time. For that reason, this work explores several alternatives to mitigate this phenomenon. These alternatives are divided into two groups: on the one hand, the refoaming of the shrunken foams using supercritical CO₂ and N₂ was explored; on the other hand, the foaming using mixtures of supercritical CO₂ and N₂ as foaming agents was carried out. After experiments, it was seen that, the refoaming with N₂ of shrunken foams obtained by supercritical CO₂ technology can increase and keep constant the initial expansion ratio of the shrunken foams. Moreover, it was also observed that ratios of CO₂/N₂ between 80/20 and 60/40 can avoid the shrinking issues suffered by the polymeric foams after foaming using supercritical technology.

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使用超临界二氧化碳和氮气使热塑性聚氨酯发泡：抗缩策略

如今，将热塑性聚氨酯转化为聚合泡沫塑料正引起人们的极大兴趣。然而，这项技术也面临着一些需要解决的难题，其中最重要的是聚合泡沫会随着时间的推移而收缩。因此，这项工作探索了几种替代方法来缓解这一现象。这些替代方案分为两组：一组是探索使用超临界 CO 和 N 对收缩泡沫进行再发泡；另一组是使用超临界 CO 和 N 的混合物作为发泡剂进行发泡。实验结果表明，用 N 对超临界 CO 技术获得的收缩泡沫进行再发泡，可以提高收缩泡沫的初始膨胀率并使其保持不变。此外，实验还发现，CO/N 比率在 80/20 和 60/40 之间，可以避免聚合物泡沫在使用超临界技术发泡后出现的收缩问题。

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来源期刊

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.