Generation of microcellular polymeric foams using supercritical carbon dioxide. I: Effect of pressure and temperature on nucleation

1994 ◽  
Vol 34 (14) ◽  
pp. 1137-1147 ◽  
Author(s):  
Satish K. Goel ◽  
Eric J. Beckman
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polymeric Foams ◽  
Effect Of Pressure ◽  
Supercritical Carbon

Microcellular Polymeric Foams (MPFs) Generated Continuously in Supercritical Carbon Dioxide

2000 ◽  
Vol 629 ◽  
Author(s):  
Srinivas Siripurapu ◽  
Yvon J. Gay ◽  
Joseph R. Royer ◽  
Joseph M. DeSimone ◽  
Saad A. Khan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Vinylidene Fluoride ◽  
Amorphous Polymer ◽  
Extrusion Process ◽  
Operating Conditions ◽  
Polymeric Foams ◽  
Poly Vinylidene Fluoride ◽  
Cell Densities ◽  
Supercritical Carbon

ABSTRACTMicrocellular polymeric foams (MPFs) hold tremendous promise for engineering applications as substitutes to their solid analogs in light of reduced manufacturing/materials costs and improved properties. We present a two-part study addressing the generation of such materials in the presence of supercritical carbon dioxide (scCO2). The first part describes the production of polystyrene MPFs in a continuous extrusion process, as well as the effect of operating conditions such as temperature and CO2 concentration on foam morphology. The second part discusses microcellular foaming of poly (vinylidene fluoride) (PVDF), a semicrystalline polymer, via blending with the amorphous polymer poly (methyl methacrylate) PMMA. Foams of pure PVDF possess ill-defined morphologies, whereas those of PVDF-PMMA blends show an improvement with cell sizes on the order of 10 mm or less and cell densities in excess of 109 cells/cm3.

The effect of pressure on the characteristics of supercritical carbon dioxide extracts from Calamintha nepeta subsp. nepeta

2020 ◽  
Vol 34 (9) ◽  
Author(s):  
Haïfa Debbabi ◽  
Ridha El Mokni ◽  
Siwar Majdoub ◽  
Aslan Aliev ◽  
Saoussen Hammami
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Effect Of Pressure ◽  
Supercritical Carbon

scholarly journals Effect of pressure of supercritical carbon dioxide on morphology of wool fibers during dyeing process

2015 ◽  
Vol 19 (4) ◽  
pp. 1297-1300 ◽  
Author(s):  
Lai-Jiu Zheng ◽  
Peng-Peng Yin ◽  
Fang Ye ◽  
Wei Ju ◽  
Jun Yan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Release Rate ◽  
Surface Brightness ◽  
Color Difference ◽  
Effect Of Pressure ◽  
Pressure Release ◽  
Dyeing Process ◽  
Wool Fibers ◽  
Supercritical Carbon

In this paper, the effect of pressure release rate on dyeing of wool fibers was studied in the supercritical carbon dioxide dyeing. Surface morphology, chemical composition and color difference at different pressure release rates were investigated by employing scanning electron microscope, color matching, and measuring instrument. Experiment data reveal that wool fibers are easy to be damaged with increasing pressure release rate. Fiber?s surface brightness varies also with the pressure release rate. The phenomena are theoretically explained using Bernoulli's principle.

Characterization of Microcellular Biodegradable Polymeric Foams Produced from Supercritical Carbon Dioxide Solutions

2005 ◽  
Vol 44 (6) ◽  
pp. 1795-1803 ◽  
Author(s):  
S. Cotugno ◽  
E. Di Maio ◽  
G. Mensitieri ◽  
S. Iannace ◽  
G. W. Roberts ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Polymeric Foams ◽  
Supercritical Carbon

Study of the Effect of Pressure on Melting Behavior of Saturated Fatty Acids in Liquid or Supercritical Carbon Dioxide

2013 ◽  
Vol 58 (6) ◽  
pp. 1861-1866 ◽  
Author(s):  
Vivek Trivedi ◽  
Ruchir Bhomia ◽  
John C Mitchell ◽  
Nichola J Coleman ◽  
Dennis Douroumis ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acids ◽  
Supercritical Carbon Dioxide ◽  
Saturated Fatty Acids ◽  
Melting Behavior ◽  
Effect Of Pressure ◽  
Supercritical Carbon

scholarly journals Effect of pressure, depressurization rate and pressure cycling on the inactivation of Escherichia coli by supercritical carbon dioxide

Food Control ◽  
2013 ◽  
Vol 29 (1) ◽  
pp. 76-81 ◽  
Author(s):  
Juliana Melo Silva ◽  
Aline A. Rigo ◽  
Irede A. Dalmolin ◽  
Isabel Debien ◽  
Rogério L. Cansian ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Effect Of Pressure ◽  
Pressure Cycling ◽  
Supercritical Carbon
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