Manufacturing and acoustical characterization of electrospun PolyVinylPyrrolidone (PVP) Blankets
نویسنده
چکیده
In this work, new light soundproofing fibrous materials were obtained through electrospinning technique. The sound absorbers were obtained in the form of blankets of thin disks of 10 cm diameter, characterized by fibres with a diameter in order of 2 μm. Different activities involved for acoustical characterization of specimens, in particular to the evaluation of the sound absorption coefficient and flow resistance. Sound absorption coefficient was measured by a Kundt’s tube; for the evaluation of flow resistance a prototypal facility was designed and developed using a theoretical model proposed by Uno Ingard. The acquisition system of this prototype was programmed and controlled in Labview. The acoustic properties of electrospun woven mats are compared to the traditional soundproofing materials ones. The effect of assembling PVP and traditional soundproofing glass wool on sound absorption is also shown. The experimental results suggest that sound energy dissipation occurs for a mixing of fibres friction absorption and a resonance phenomena of the sound wave with the natural frequency of vibration of the disks pile (acting as a membrane).
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