Journal
POLYMER
Volume 245, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.124705
Keywords
Polymethylacrylimide; Aerogel; Open-cell; Freeze-drying
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Low shrinkage, open-cell structure, and mechanically-strong PMI aerogels were synthesized using a freezing-drying process. Heat treatment reduced the shrinkage of the PMI aerogels. The fabricated aerogels exhibited a network-like structure with high porosity, and increasing the copolymer solid contents improved the compression property.
Low shrinkage, open-cell structure, and mechanically-strong polymethylacrylimide (PMI) aerogels were synthesized using a freezing-drying process. Specifically, methacrylonitrile (MAN) and methacrylic acid (MAA) were used as the comonomers to synthesis the copolymer. PMI aerogels after heat treatment presented the lowest shrinkage of 10.5%. The fabricated aerogels exhibited a network-like structure with the minimum measured porosity of 89%. Increasing the copolymer solid contents resulted in a better compression property. The maximum stress of the PMI aerogels at 50% strain can reach 0.256 MPa. The fabricated aerogels presented low thermal conductivity and density, as low as 43 mW/mK and 0.050 g/cm(3), respectively.
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