Preparation and characterization of carbonyl iron powder/millable polyurethane elastomer microwave absorbing patch

Abstract

A microwave absorbing patch (MAP) was prepared by compounding millable polyurethane elastomer (MPU) and carbonyl iron powder (CIP). Surfaces of CIP were modified using silane coupling agents (SCA). The effects of different types and amounts of SCA, the amount of vulcanizing agent and the amount of CIP on the microstructure and mechanical properties were investigated. SCA was found to improve the interface compatibility between MPU and CIP and also reinforced the mechanical properties of MAP. The KH550 was the best modifier, and the optimal dosage of KH550 was 2% of the mass of CIP based on a comparison of tensile properties. The optimal dosage of the vulcanizing agent DDPH was 3% of the mass of MPU. However, a large number of CIP could be filled into MPU. The maximum filling content of CIP increased with the increasing Mooney viscosity of MPU, and the maximum filling content of CIP was 1200% of the mass of MPU. The electromagnetic parameters and reflection loss of MPU absorbers and MPU filled with CIP absorbers were measured in the 1-18 GHz frequency range. The absorbers of MPU filled with CIP had excellent microwave absorbing properties compared with the absorbers of MPU. POLYM. COMPOS., 35:1318-1324

Electromagnetic and mechanical properties of carbonyl iron powder‐filled methyl vinyl silicone rubber during thermal aging

“…The real ( ε′ ) and imaginary ( ε″ ) parts of complex permittivity correspond to the storage and loss of dielectric energy, respectively. Similar to complex permittivity, the real ( μ′ ) and the imaginary ( μ″ ) parts of complex permeability correspond to the storage and loss of magnetic energy, respectively . From the figures of complex permittivity (Fig.…”

“…The RL value of −10 dB corresponded to 90% microwave absorption, which was considered as effective absorption . Figure shows the RL of the CIP/VMQ composite‐absorbing material at different aging time; these values were measured in the frequency range of 1–18 GHz.…”

Biological and mechanical characterization of biodegradable carbonyl iron powder/polycaprolactone composite material fabricated using three-dimensional printing for cardiovascular stent application

“…[14][15][16] Among micro-sized particles, CIP is a pure form of iron which has a great potential to amend the mechanical properties as well as biological properties by reinforcement in polymer matrix desired for the cardiovascular applications. 15,[17][18][19][20] The properties such as slow rate of degradation, zero segmentation with blood plasma, negligible toxicity, prominent physical strength, zero inflammation, biocompatible, radiopaque, and antithrombotic make iron as an attractive material for biodegradable cardiovascular stents. 5,18,19,[21][22][23][24] Solvent cast three-dimensional (SC3D) printing is a method of direct printing of thermoplastics by dissolving the polymers in a solvent that is directly used for extrusion-based rapid manufacturing.…”

“…Numerous researchers [15][16][17][27][28][29][30][31] have been working in the direction of improving the physical properties of PCL by the development of composite material. Russo et al 16 developed a composite material for bone tissue engineering consisting of a PCL matrix strengthened by the addition of sol-gel-derived PCL/ZrO 2 and PCL/ TiO 2 fillers.…”

“…The results revealed the increase in tear strength, tensile strength, and hardness of the developed polymer composites with a homogeneous mixing. 15,17,34,35 Thus, researchers revealed the development of the composite with PCL had an effect on the mechanical characteristics of the material. However, research on the development of polymer composite with pure metal is still under study.…”