Journal
ADVANCED ENGINEERING MATERIALS
Volume 24, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202101124
Keywords
compression performance; microcellular polyethylene terephthalate; molding compression foaming process; supercritical CO2; viscoelasticity
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Funding
- National Key Research and Development Program of China [2016YFB0302200]
- Fundamental Research Funds for the Central Universities [JKA012011002]
- 111 Project [B20031]
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Supercritical CO2 molding compression foaming is an emerging technology for preparing thick microcellular polymer sheets. The molding compression foaming behavior of polyethylene terephthalate (PET) is systematically studied in a specific temperature and CO2 foaming pressure range.
Supercritical CO2 molding compression foaming is an emerging technology for preparing thick microcellular polymer sheets. In a temperature range of 245-255 degrees C and CO2 foaming pressure range of 5-20 MPa, the molding compression foaming behavior of polyethylene terephthalate (PET) is systematically studied. The maximum expansion ratio of the prepared PET foams is above 30, while the bubble size is only approximate to 20 mu m. It is observed that during the foaming process, the temperature drop caused by rapid depressurization reaches up to 57 degrees C, which greatly changes the viscoelasticity of PET and limits its foaming behavior. The nucleation and bubble growth behavior of PET is simulated and analyzed based on this change in viscoelasticity. Microcellular PET foams have excellent compression performance due to their smaller cell size and thinner cell wall, and the compression elastic modulus of the prepared microcellular PET sample is twice that of the extrusion foaming PET sample with a similar expansion ratio.
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