Melting and crystallization temperatures, foaming, and fluid-induced crystallization of poly (ε-caprolactone) in compressed CO2 and N2

IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-04-26 DOI:10.1016/j.supflu.2024.106293
Dawn D. Rhee, Emma M. Troiano, Grant Floyd, Erdogan Kiran
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Abstract

Melting and crystallization temperatures of poly(ε-caprolactone)(PCL) exposed to CO2 and N2 have been evaluated at pressures up to 125 bar using High Pressure Torsional Braid Analysis. It is shown that in contrast to CO2, exposure to high pressure N2 does not lead to a significant depression of Tm or Tc. Instead, these transition temperatures tend to increase in nitrogen, reflecting more of a hydrostatic pressure rather than a solvent effect. Another factor that may play a role is the fluid-induced crystallization which tends to increase the melting temperature. By conducting foaming at properly selected temperatures along the rigidity reduction paths which are scaled with respect to the melting temperatures in CO2 or N2, foams with low bulk foam densities of about 0.2 g/cm3 could be generated in CO2 at 100 bar and in N2 at 200 bar.

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聚(ε-己内酯)在压缩二氧化碳和氮气中的熔化和结晶温度、发泡和流体诱导结晶
利用高压扭转编织分析法评估了聚(ε-己内酯)(PCL)在 125 巴压力下接触二氧化碳和 N2 时的熔化和结晶温度。结果表明,与 CO2 不同,暴露于高压 N2 不会导致 Tm 或 Tc 明显降低。相反,这些转变温度在氮气中往往会升高,这更多地反映了静水压力而不是溶剂效应。另一个可能起作用的因素是流体引起的结晶,它往往会提高熔化温度。在二氧化碳或氮气中,沿着与熔化温度成比例的刚度降低路径,在适当选择的温度下进行发泡,可在 100 巴的二氧化碳和 200 巴的氮气中生成体积泡沫密度约为 0.2 克/立方厘米的泡沫。
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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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