Enhanced Properties of Oriented Multilayer Polypropylene Film/foams
نویسندگان
چکیده
This research work presents an understanding of structure-property relationship in uniaxially oriented multilayer polypropylene (PP) film/foams. Multilayer PP film/foams having 16 layers have been produced by using a unique coextrusion and multiplication technique. A post-uniaxial drawing process at a certain temperature has been carried out to orient the multilayer film/foams in extrusion direction. Oriented film/foam samples were collected at different draw ratios (DR). Bulk density of oriented samples decrease with increasing draw ratio of film/foams up to a DR of 2.5 (ρDR=2.5 = 3.0 g/cm) and then increases slightly at higher DR. In addition, the modulus and fracture stress increase with increasing draw ratio. Thus, a light weight and strong composite structure comprising alternating layers of PP film and foams have been successfully fabricated.
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