Light Electrospun Polyvinylpyrrolidone Blanket for Low Frequencies Sound Absorption
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Light polymeric soundproofing materials (density = 63 kg/m3) of interest for the transportation industry were fabricated through electrospinning. Blankets of electrospun polyvinylpyrrolidone (average fiber diameter = (1.6 ± 0.5) or (2.8 ± 0.5) μm) were obtained by stacking disks of electrospun mats. The sound absorption coefficients were measured using the impedance tube instrument based on ASTM E1050 and ISO 10534–2. For a given set of disks (from a minimum of 6) the sound absorption coefficient changed with the frequency (in the range 200–1600 Hz) following a bell shape curve with a maximum (where the coefficient is greater than 0.9) that shifts to lower frequencies at higher piled disks number and greater fiber diameter. This work showed that electrospinning produced sound absorbers with reduced thickness (2–3 cm) and excellent sound-absorption properties in the low and medium frequency range.
KeywordsElectrospinning Polyvinylpyrrolidone (PVP) Sound absorption Impedance tube
This work has been partially supported and funded by the Department of Education, Research, Labour, of the Cultural Politics and Social Politics of Campania Region under the research program “MITO-Improvement and Innovation of “Thermoacoustical Material for Aeronautical Applications” PO FESR Campania 2007/2013, OO 2.1; CUP: B68C12000640007, Code SMILE: 150. This support is greatly appreciated and acknowledged by the authors. Professor Gino Iannace of the Dept. of “Architettura e Disegno Industriale” of the University of Campania “Luigi Vanvitelli”, member of UNI committee on Acoustics and Vibration, who kindly made available the apparatus for the measurement of flow resistivity, is highly acknowledged. The valuable experimental support of Luciano Cortese, in charge of SEM laboratory of Istituto di Ricerche sulla Combustione of Consiglio Nazionale delle Ricerche of Naples, is highly acknowledged.
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