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Title: Energy-damping behaviors of poly(methyl acrylate-co-divinylbenzene) microspheres coated with a porous nickel-phosphorus layer
Authors: Ng, Y.H.
Hong, L. 
Keywords: Core-shell polymers
Glass transition
Poly(methyl acrylate-co-divinyl benzene)
Ultrasonic wave attenuation
Issue Date: 15-Jul-2004
Citation: Ng, Y.H., Hong, L. (2004-07-15). Energy-damping behaviors of poly(methyl acrylate-co-divinylbenzene) microspheres coated with a porous nickel-phosphorus layer. Journal of Polymer Science, Part B: Polymer Physics 42 (14) : 2710-2723. ScholarBank@NUS Repository.
Abstract: Hybrid microspheres of poly(methyl acrylate-co-divinylbenzene) (PMADVB) with a thin and porous nickel-phosphorus (Ni-P) alloy layer were prepared via suspension polymerization and electroless nickel plating. The characterization of pristine and nickel-coated microspheres was carried out with a differential scanning calorimeter and a scanning electron spectroscope equipped with an energy-dispersive system. The glass-transition range of Ni-P-coated PMADVB was broadened and extended in the higher temperature direction. This effect allowed the PMADVB network to embrace more diversified energy states of the segment motion, this being a desired feature for damping sound waves. The low-frequency (100-1000-Hz) sound absorption behavior of the microspheres was tested with a sound attenuation kit. Besides the testing of their low-frequency damping performance, an investigation into the ultrasonic-wave (∼35 kHz) absorption feature of the microspheres was conducted through chemical means; that is, the attenuation to the ultrasonic wave with respect to the unprotective situation was assessed through the chemisorption extent of copper ions on a biomass adsorbent. The Ni-P deposition layer was found to augment the damping capacity of the polymer network. The alloy layer was determined to cause an expansion of the glass-transition range of PMADVB and its wave-scattering capability because this layer was made up of submicrometer metallic grains. In this work, the particulars of the metal-polymer interactions were associated with a core-shell structure. The metal outer layer was thought to create a spherical temperature field inside the PMADVB network, and concerted motions of the polymer segments resulted. © 2004 Wiley Periodicals, Inc.
Source Title: Journal of Polymer Science, Part B: Polymer Physics
ISSN: 08876266
DOI: 10.1002/polb.20145
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