June 20, 2021

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Foaming with Supercritical Fluids

Foaming with Supercritical Fluids
Author : Ernesto Di Maio,Salvatore Iannace,Giuseppe Mensitieri
Publisher : Elsevier
Release Date : 2021-11-01
Category : Science
Total pages :482
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Foaming with Supercritical Fluids

Supercritical Fluid Foaming

Supercritical Fluid Foaming
Author : Matthew S. Purcell
Publisher : Unknown
Release Date : 2014
Category :
Total pages :129
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Blend- and Surface-assisted Foaming of Polymers with Supercritical Carbon Dioxide

Blend- and Surface-assisted Foaming of Polymers with Supercritical Carbon Dioxide
Author : Srinivas Siripurapu
Publisher : Unknown
Release Date : 2003
Category :
Total pages :182
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Keywords: polymer surfactants, polymer blends, high pressure rheology, controlled foam nucleation, carbon dioxide, nanoporous polymers, microcellular foam, supercritical fluids.

Polymer Processing with Supercritical Fluids

Polymer Processing with Supercritical Fluids
Author : Vannessa Goodship,Erich Okoth Ogur
Publisher : iSmithers Rapra Publishing
Release Date : 2005
Category : Science
Total pages :138
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SCFs are currently the subjects of intense research and commercial interest. Applications such as the RESS (rapid expansion of supercritical fluid solutions) process are part of standard industrial practice. In view of their ever-growing importance in the polymer industry there is a need to fully comprehend how supercritical fluids interrelate with polymeric materials to realise the potential that can be gained from their use. The authors review the basic principles of SCFs and their application within the polymer industry: characteristics and properties, extraction of unwanted residual products, polymerisation solvents, and polymer impregnation. Processing applications such as plasticisation, foaming and blending are also considered. There is discussion of the potential within the polymer recycling industry for use of SCFs as cleaning agents or within supercritical oxidation processes. Around 400 references with abstracts from recent global literature accompany this review, sourced from the Polymer Library, to facilitate further reading. A subject index and a company index are included.

Advanced Nanotechnology and Application of Supercritical Fluids

Advanced Nanotechnology and Application of Supercritical Fluids
Author : Inamuddin,Abdullah M. Asiri
Publisher : Springer Nature
Release Date : 2020-07-27
Category : Science
Total pages :245
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Globalization and industrialization involve a number of reactions, products, extractions, and separations that require the use of organic solvents. These solvents are responsible for a number of ecological concerns, including atmospheric and land toxicity. Conventional organic solvents are regarded as volatile organic compounds; some are even limited due to their potential for ozone layer depletion. While supercritical liquids exhibit physical properties that could make them ideal substitutes for these volatile compounds, there is particular interest in the use of carbon dioxide as a solvent of crude material. In particular, carbon dioxide has apparent ‘green’ properties, like its noncombustible nature, the fact that it is generally nonpoisonous, and its relative inertness. Thus, the use of supercritical carbon dioxide can provide practical improvements to the sustainability of industrial products and processes. This book provides in-depth literature in the area of industrial green processes, focusing on the separation, purification, and extraction of compounds utilizing supercritical carbon dioxide as a green solvent.

Advanced Supercritical Fluids Technologies

Advanced Supercritical Fluids Technologies
Author : Igor Pioro
Publisher : BoD – Books on Demand
Release Date : 2020-05-20
Category : Science
Total pages :222
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Using SuperCritical Fluids (SCFs) in various processes is not new, because Mother Nature has been processing minerals in aqueous solutions at critical and supercritical pressures for billions of years. Somewhere in the 20th century, SCFs started to be used in various industries as working fluids, coolants, chemical agents, etc. Written by an international team of experts and complete with the latest research, development, and design, Advanced Supercritical Fluids Technologies is a unique technical book, completely dedicated to modern and advanced applications of supercritical fluids in various industries.Advanced Supercritical Fluids Technologies provides engineers and specialists in various industries dealing with SCFs as well as researchers, scientists, and students of the corresponding departments with a comprehensive overview of the current status, latest trends and developments of these technologies.Dr Igor Pioro is a professor at the University of Ontario Institute of Technology, Canada, and the Founding Editor of the ASME Journal of Nuclear Engineering and Radiation Science.

Polymer-supercritical Fluid Systems and Foams (P-(SF)2)

Polymer-supercritical Fluid Systems and Foams (P-(SF)2)
Author : Japan Society of Polymer Processing,SPE Thermoplastic Materials & Foams Division
Publisher : Unknown
Release Date : 2003
Category :
Total pages :228
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Polymer Nanocomposite Foams

Polymer Nanocomposite Foams
Author : Vikas Mittal
Publisher : CRC Press
Release Date : 2013-10-18
Category : Technology & Engineering
Total pages :264
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Advancements in polymer nanocomposite foams have led to their application in a variety of fields, such as automotive, packaging, and insulation. Employing nanocomposites in foam formation enhances their property profiles, enabling a broader range of uses, from conventional to advanced applications. Since many factors affect the generation of nanost

Continuous Microcellular Foaming of Polyvinyl Chloride and Compatibilization of Polyvinyl Chloride and Polylactide Composites

Continuous Microcellular Foaming of Polyvinyl Chloride and Compatibilization of Polyvinyl Chloride and Polylactide Composites
Author : Bhavesh Shah
Publisher : Unknown
Release Date : 2007
Category : Composite materials
Total pages :334
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Research in Materials

Research in Materials
Author : Massachusetts Institute of Technology
Publisher : Unknown
Release Date : 1993
Category : Materials
Total pages :129
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Cellular and Microcellular Materials

Cellular and Microcellular Materials
Author : Vipin Kumar,Karl A. Seeler
Publisher : Unknown
Release Date : 1994
Category : Plastic foams
Total pages :283
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Cellular and Microcellular Materials

Cellular and Microcellular Materials
Author : Anonim
Publisher : Unknown
Release Date : 1994
Category : Plastic foams
Total pages :129
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Polymer processing using supercritical fluids

Polymer processing using supercritical fluids
Author : Elena Aionicesei,Željko Knez,Mojca Škerget
Publisher : Unknown
Release Date : 2009
Category :
Total pages :183
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The traditional methods for polymer processing use environmentally hazardous volatile organic solvents and chlorofluorocarbons. Due to the increase of hazardous solvent emission and generation of aqueous waste streams, there is an obvious need of finding new and cleaner methods for the processing of polymers. Supercritical carbon dioxide (scCO2) has attracted particular attention for these applications due to its tremendous potential as a plasticizer in polymer processing. A particular interest is shown to the use of supercritical fluids for processing polymers destined for biomedical applications (as microspheres, microcapsules, foams, membranes, polymer/drug composites). The method offers important advantages related to the absence of harmful organic solvents or, when necessary, the efficient extraction of solvents and impurities, the mild processing conditions and the control of particle and foams morphology by simple variation of pressure and temperature. Despite the huge potential of scCO2 as a ʺgreenʺ solvent for processing biocompatible and biodegradable polymers, the phase equilibrium data, essential for process design, are quite scarce. Optimum processing techniques and parameters (pressure, temperature) still need consideration andstudy. The data are especially scarce regarding the scCO2 processing of polymer/ceramic composites for biomedical applications. On this basis, this thesis is aimed to open new perspectives over the use of scCO2 as a ʺgreenʺ solvent for the processing of biodegradable polymers and composites used as biomaterials. Two biodegradable polymers were chosen for this study, poly(L-lactide) (PLLA) and poly(D,L-lactide-co-glycolide) (PLGA). Their composite with a bioactive ceramic powder, hydroxyapatite (HA), was also studied. The main idea followed by this thesis was the obtaining of porous polymeric or composite material scaffolds suitable for tissue engineering under mild temperature conditions and without the use of additional organic solvents. The behavior of the two polymers under dense CO2 had been studied and explained. More data about the polymer-gas phase equilibrium, necessary for understanding and optimizing the effect of processing parameters, were obtained by determining the solubility and diffusion coefficients of CO2 in the polymers for certain values of temperature and pressure. The solubility ofCO2 was measured for each polymer for three different temperatures (308, 313and 323 K) in the pressure range 10 - 30 MPa. The temperatures were chosen higher than the critical temperature for CO2, but still low enough so as not to affect the bioactivity of any drugs or proteins that could be introduced in the system during processing. The same range of temperature and pressure was employed for all tests involving the studied polymers or their composite materials. The efficiency of mixing in the presence of scCO2 for obtaining composite materials from PLLA and HA and respectively PLGA and HA was studied by comparison with coprecipitation. The solubility and diffusion coefficient of CO2 in the composite materials were afterward determined, and the results were compared with the ones obtained for the polymer alone in order to determine the effect of the ceramic filler on the gas uptake. The possibility of obtaining porous scaffolds was assessed by using a pressure quench technique using dense CO2 as blowing agent, with and without the presence of aporogen. The effect of pressure, temperature, depressurization rate and porogen on the final porous structure was investigated. The experimental results were compared with literature data and with data obtained by mathematical modeling, employing equations of state commonly used for polymersor polymer/solvent systems. The results indicate that gas foaming of biodegradable polymers represents a promising technique for obtaining tissue engineering scaffolds with the desired structure. Still the processing parameters need to be studied and optimized, according to the nature of the substrate and of the aimed final product.

Supercritical Fluid Engineering Science

Supercritical Fluid Engineering Science
Author : Erdogan Kiran,Joan F. Brennecke,American Institute of Chemical Engineers. Meeting
Publisher : Amer Chemical Society
Release Date : 1993
Category : History
Total pages :410
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Current state of supercritical fluid science and technology, high-pressure vapor-liquid equilibria in carbon dioxide and 1-alkanol mixture, phase behavior of supercritical fluid-entrainer systems, three-phase behavior in binary mixtures of near-critical propane and triglycerides multiphase equilibrium behavior of a mixture of carbon dioxide, 1-de canol, and n-tetradecane, group contribution method for estimating the solubility of selected hidrocarbon solutes in supercritical carbonequation-of-state analysis of phase behavior for water-surfactant-supercritical fluid mixture, diffusion in liquid and supercritical fluid mixtures, viscosity of polymer solutions in near-critical and supercritical fluids: polystyrene and n-butane thermophysical properties of natural gas mixtures derived from acoustic cavity measurements, competitive energetic and entropic effects describing solvation in near-critical solutions, chemical potentials in ternary supercritical fluid mixtures, aggregation of methanol in supercritical fluids, hidrogen bonding of simple alcohols in supercritical fluids, adsorption from supercritical fluids, spectroscopic investigations of reactions, fluorescence spectroscopy study of alcohol, effects of specific interactions in supercritical fluid solutions, applications of supercritical fluids of controlled release, dynamic fluorescence, light scattering, simulation and optimization, organic component kinect model, oxidation process, removal of hetero atoms, gas density.

Process Dynamics and Material Properties for Supercritical Fluid Extrusion of Starch-based Microcellular Foams

Process Dynamics and Material Properties for Supercritical Fluid Extrusion of Starch-based Microcellular Foams
Author : Sajid H. Alavi
Publisher : Unknown
Release Date : 2002
Category :
Total pages :288
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