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A high‐performance polymethacrylimide (PMI) foam was prepared from the reactive monomers of acrylonitrile (AN) and methacrylic acid (MAA) via ultrasonic combined with thermal initiation radical bulk copolymerization and free heat foaming. The reaction progress of cyano and carboxyl groups were tracked by Fourier transform infrared (FTIR) spectroscopy and X‐ray Photoelectron Spectroscopy, and the results...
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