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Vitrification Conditions and Porosity Prediction of CO2 Blown Polystyrene Foams.
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SYSNO ASEP 0484016 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Vitrification Conditions and Porosity Prediction of CO2 Blown Polystyrene Foams. Author(s) Sovová, Helena (UCHP-M) RID, ORCID, SAI
Nistor, A. (CZ)
Topiař, Martin (UCHP-M) RID, ORCID, SAI
Kosek, J. (CZ)Source Title Journal of Supercritical Fluids. - : Elsevier - ISSN 0896-8446
Roč. 127, SEP 2017 (2017), s. 1-8Number of pages 8 s. Action Iberoamerican Conference on Supercritical Fluids ProSCiba 2016 /4./ Event date 28.03.2016 - 01.04.2016 VEvent location Vina del Mar Country CL - Chile Event type WRD Language eng - English Country NL - Netherlands Keywords polymer foam ; supercritical CO2 ; heat transfer Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering R&D Projects GA14-18938S GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000405879400001 EID SCOPUS 85016410539 DOI 10.1016/j.supflu.2017.03.013 Annotation Experiments with CO2-blown hanging polystyrene (PS) films were carried out. The porosity of foams decreased with decreasing film thickness, indicating thus effects of heat and/or mass transfer. Taking into account the Joule-Thomson effect, mathematical model based on a simplified heat balance for the system PS+CO2 at the conditions of PS saturation with CO2 on one side and at the conditions of foam vitrification at glass transition temperature on the other side was derived to estimate the foam porosity. The model was applied to data on CO2-blown hanging films as well as literature data on foaming of PS particles. The trends of porosity dependence on saturation temperature and film thickness predicted by the model correspond to experimental results. The Joule-Thomson effect included in the modelling of the CO2 foaming process significantly affects the foam porosity and improves the predictive capabilities of simple model based on enthalpy balance and thermodynamic data. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2018
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