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Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO 2 )‐Epoxy Composites
Author(s) -
Ting TzuHao
Publication year - 2009
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200900176
Subject(s) - manganese , epoxy , scanning electron microscope , microwave , chemistry , dispersion (optics) , composite material , permittivity , absorption (acoustics) , reflection loss , analytical chemistry (journal) , composite number , materials science , dielectric , optics , optoelectronics , physics , organic chemistry , quantum mechanics , chromatography
Manganese dioxide (MnO 2 ) particle was synthesized and introduced into epoxy resin to be microwave absorber. The spectroscopic characterization of the formation processes of MnO 2 was studied by using X‐ray diffraction (XRD) and scanning electron microscopy (SEM). Microwave absorbing properties with different volume fractions of MnO 2 were investigated by measuring complex permittivity, complex permeability and reflection loss in the 2–18 and 18–40 GHz microwave frequency range using the free space method. The absorbing performance of MnO 2 ‐epoxy composites at same sample thickness and at various sample thickness were also studied. It was found that the best absorbing property and an absorption frequency range shifting could be obtained at the frequency range of 2–18 and 18–40 GHz.