AbstractCoextruded multifilms of varying chemical composition and structure were studied by the dynamic mechanical technique. The films studied were two‐ and three‐ply combinations of a polyimide (Kapton) and fluorinated ethylene–propylene copolymer (FEP) and four other two‐ply polyethylene and modified polyethylene composites: low‐density polyethylene (LDPE)–ionomer, rubber‐modified high‐density polyethylene (HDPE)–ionomer; ethylene–vinyl acetate (EVA) copolymer–LDPE, and EVA‐modified HDPE–LDPE. The mechanical spectra of individual film components were also obtained at 110 Hz between −120° and 120°C (220°C for the Kapton–FEP system). Mechanical relaxations were examined to determine the degree of interaction between adjacent films and correlate them with tensile and ulti
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