P. Belmonte , M. Céspedes , M.J. Ramos , J.F. Rodríguez , I. Garrido , M.T. García , J.M. García-Vargas
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引用次数: 0
摘要
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。
Foaming of thermoplastic polyurethane using supercritical CO2 AND N2: Antishrinking strategy
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.
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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