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Effect of Organic Co-blowing Agents on the Morphology of CO2 Blown Microcellular Polystyrene Foams.
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SYSNO ASEP 0476682 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of Organic Co-blowing Agents on the Morphology of CO2 Blown Microcellular Polystyrene Foams. Author(s) Nistor, A. (CZ)
Topiař, Martin (UCHP-M) RID, ORCID, SAI
Sovová, Helena (UCHP-M) RID, ORCID, SAI
Kosek, J. (CZ)Source Title Journal of Supercritical Fluids. - : Elsevier - ISSN 0896-8446
Roč. 130, DEC 2017 (2017), s. 30-39Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords polystyrene ; closed-cell microcellular foam ; co-blowing agent 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 000412254200005 EID SCOPUS 85026452944 DOI 10.1016/j.supflu.2017.07.026 Annotation Microcellular polystyrene (PS) foams blown with supercritical CO2 in batch processes have usually porosities lower than desired for good heat insulators. Porosities can be increased by co-blowing agents. We studied effects of n-pentane (nC5) and cyclopentane (cC5) on foaming in a batch. Neat PS films were impregnated first with nC5 or cC5, then with high-pressure or supercritical CO2, and finally foamed. Cell diameters and bulk porosities were determined from SEM images. The co-blowing agents reduced the solid skin, they acted mainly as plasticizers, both porosity and cell diameters increased with their concentration. After crossing a particular concentration, the cell size remained almost constant. Impregnation of neat PS with high-pressure liquid CO2 near room temperature enabled to prepare foams with cell diameters below 10 μm and porosities about 80 %, which has not been reported before. Hence, organic co-blowing agents could be used to increase the porosity of CO2 blown foams. 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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