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Controlling the foam morphology of supercritical CO2-processed poly(methyl methacrylate) with CO2-philic hybrid nanoparticles
Date
2021-04-01
Author
Özkutlu Demirel, Merve
Bayram, Göknur
Dilek Hacıhabiboğlu, Çerağ
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Highly CO2-philic nanoparticles, octatrimethylsiloxy polyhedral oligomeric silsesquioxanes (POSS) are used to increase the affinity of poly(methyl methacrylate) (PMMA) to CO2 in supercritical carbon dioxide (scCO(2)) foaming, thus to improve its foaming performance and the foam morphology. PMMA and PMMA-POSS composite foams were produced based on the two-factorial design, at the upper and lower experimental conditions of pressure, temperature, processing time, and venting rate. The foams of PMMA-5% POSS composites exhibited smaller average pore sizes and higher pore densities than neat PMMA and PMMA-0.5% POSS composites. The smallest average pore diameter (0.3 mu m) and the highest pore density (6.33 x 10(12) cm(-3)) were obtained with this composite processed at 35 degrees C, 32 MPa, for 24 h and depressurized with fast-venting rate (0.4 MPa/s). ScCO2 processing decreased the density of the polymer by more than 50%.
URI
https://hdl.handle.net/11511/90027
Journal
JOURNAL OF APPLIED POLYMER SCIENCE
DOI
https://doi.org/10.1002/app.50814
Collections
Department of Chemical Engineering, Article
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M. Özkutlu Demirel, G. Bayram, and Ç. Dilek Hacıhabiboğlu, “Controlling the foam morphology of supercritical CO2-processed poly(methyl methacrylate) with CO2-philic hybrid nanoparticles,”
JOURNAL OF APPLIED POLYMER SCIENCE
, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/90027.