Integrated process of supercritical CO2-assisted melt polycondensation modification and foaming of poly(ethylene terephthalate) |
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| Affiliation: | 1. Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia;2. University of Erlangen-Nuremberg, Egerlandstrasse 5, D-91058 Erlangen, Germany;1. Analytical Laboratory of Advanced Ferroelectric Crystals, Jeonju University, Jeonju 55069, South Korea;2. Department of Science Education, Jeonju University, Jeonju 55069, South Korea;3. Western Seoul Center, Korea Basic Science Institute, Seoul 03759, South Korea;1. Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentieva Av, Novosibirsk 630090, Russian Federation;2. Novosibirsk State University, 2 Pirogova Str., Novosibirsk 630090, Russian Federation;1. Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russian Federation;2. St. Petersburg Academic University, St. Petersburg 194021, Russian Federation;3. Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation;1. Laboratoire de Chimie des Polymères Organiques—Ecole Nationale Supérieure de Chimie, de Biologie et de Physique, UMR CNRS 5629, Université de Bordeaux, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France;2. University of Waterloo, Department of Chemical Engineering, 200 University Av. W, Waterloo, ON N2L 3G1, Canada;3. University of Waterloo, Department of Chemistry, 200 University Av W., Waterloo, ON N2L 3G1, Canada |
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| Abstract: | An integrated process of melt polycondensation modification and foaming of poly(ethylene terephthalate) (PET) was performed in a high pressure vessel assisted by supercritical carbon dioxide (scCO2). ScCO2 was firstly employed to sweep PET melt, i.e., high pressure CO2 continuously flows through the vessel at a fixed flow rate to remove small molecules for higher molecular weight PET, then this modified PET melt was directly foamed through a rapid depressurization process using scCO2 as blowing agent. In this integrated process, PET with high melt strength after polycondensation modification could be foamed directly in molten state. Therefore, re-molten process of solid modified PET pellets was canceled to avoid its degradation and CO2 saturation time could be saved in foaming process, thus processing time could be shortened and energy efficiency could be improved. The influences of scCO2 sweeping treatment time, pressure and flow rate on properties of the modified PETs and cell morphologies of the foamed PETs were investigated respectively. The results showed that CO2 sweeping treatment could effectively enhance PET melt polycondensation modification process, which was superior to that of N2 treatment. PET foams with average cell diameter of 32–62 μm and cell density of 1 × 107 to 4 × 107 cells/cm3 have been obtained in the integrated process. Compared with the process of only foaming modified PET by scCO2 or performing scCO2 assisted modified PET further melt polycondensation process and scCO2 foaming process separately, this integrated process produced better cell morphology. |
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