Preparation of a new foam/film structure poly (ethylene-co-octene) foam materials and its sound absorption properties

• The POE foam/film foaming sheet with alternating multilayered structure was successfully prepared through multilayer co-extrusion system.
• This technique provided the new idea to obtain structure–foaming material with high sound absorption.
• The foam/film alternating multilayered structure could be improved the sound absorption efficiency due to more reflection and friction loss of sound in layer interface. Meanwhile, the sound absorption efficiency of the foam/film foaming sheet with alternating multilayered structure increased with increasing of layer number.

Poly (ethylene-co-octene) foaming materials with alternating multilayered structure were successfully prepared through multilayer co-extrusion. Poly (ethylene-co-octene) was micro-crosslinked and fully cured before and after the foaming process with co-extrusion. The effects of the layer number on foam morphology and density of poly (ethylene-co-octene) foaming materials were investigated. It was found that with increasing the layer number, the cell size was reduced while the density was not obviously changed. Meanwhile, this technique provided the new idea to obtain the poly (ethylene-co-octene) foaming material with excellent sound absorption. The results indicated that the foam/film alternating multilayered structure could improve the sound absorption efficiency of the foaming sheet, which was increased with increasing the layer number and decreasing of cell size.

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