Applications acoustic insulation

The stndy and preparation of hollow capsules has attracted considerable attention in recent years. Hollow capsules are of immense interest in a long list of potential applications. These inclnde drug delivery, gene therapy, catalysis, waste removal, acoustic insulation, piezoelectric transducers, and functional materials [14],... 

Foamed plastics can be classified in different ways, for instance by their nature (flexible vs. rigid), chemical composition of the matrix, density, cell size, cell structure (open-celled vs. closed-celled), processing method, and dimensions. It is the aimed combination of these properties that determines the final application of the cellular polymer. As an example, open-celled ultra-low density foams are highly desirable for acoustical insulation, while rigid foams with closed-cells and elevated densities are preferred as load-carrying core materials in composite materials. 

Today, polyolefins and polyolefin-based materials are used in many applications. These applications include transportation (automotive, aerospace), packaging, medical, consumer products (toys, appliances, etc.), electronics, cable and wire coating, thermal and acoustic insulation, and building and constmction. Polyolefins can be extruded as filaments (fibers), films (cast and blown), and pipes/profiles. They can be molded into parts of various shapes. They can be foamed with physical and chemical foaming/blowing or/and can be coated onto other materials. 

Other applications include thermal and acoustic insulation and tinted films for glass in the construction industry, wood-grained or other decorative vinyls for the automotive and furniture industries, double-sided tapes for mounting or splicing, and foams for gaskets and seals in the appliance industry. 

Closed-cell foams are most suitable for thermal insulation and are generally rigid, while open-celled foams are best for car seating, furniture, bedding and acoustical insulation, among applications. These are generally flexible. 

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