Department of Occupational Health Engineering,Faculty of Medical Sciences,Tarbiat Modares University,Tehran,Iran;
Department of Polyurethane,Iran Polymer and Petrochemical Institute,Tehran,Iran;
Research Center for Environmental Health Technology,Department of Environmental Health Engineering,Iran University of Medical Sciences,Tehran,Iran;
Department of Occupational Health and Safety at Work,Workplace Health Promotion Research Center,School of Public Health and Safety,Shahid Beheshti University of Medical Sciences,Tehran,Iran;
Sound absorption coefficient; flexible polyurethane foam; nano clay; polyacrylonitrile nanofibers; polyvinyl fluoride nanofibers;