22 March 2018 Effect of the carbonyl iron particles on acoustic absorption properties of magnetic polyurethane foam
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Elastomeric matrix embedded with magnetic micro-sized particles has magnetically controllable properties, which has been investigated extensively in the last decades. In this study we develop a new magnetically controllable elastomeric material for acoustic applications at lower frequencies. The soft polyurethane foam is used as matrix material due to its extraordinary elastic and acoustic absorption properties. One-step method is used to synthesize polyurethane foam, in which all components including polyether polyols 330N, MDI, deionized water, silicone oil, carbonyl iron particle (CIP) and catalyst are put into one container for curing. Changing any component can induce the change of polyurethane foam’s properties, such as physical and acoustic properties. The effect of the content of MDI on acoustic absorption is studied. The CIPs are aligned under extra magnetic field during the foaming process. And the property of polyurethane foam with aligned CIPs is also investigated. Scanning electron microscope (SEM) is used to observe the structure of pore and particle-chain. The two-microphone impedance tube and the transfer function method are used to test acoustic absorption property of the magnetic foams.
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Jialu Geng, Jialu Geng, Caiping Wang, Caiping Wang, Honglang Zhu, Honglang Zhu, Xiaojie Wang, Xiaojie Wang, "Effect of the carbonyl iron particles on acoustic absorption properties of magnetic polyurethane foam", Proc. SPIE 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, 105961W (22 March 2018); doi: 10.1117/12.2294518; https://doi.org/10.1117/12.2294518

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