Abstract
LDPE blends of variable composition are prepared with several polymer additives, which include chromic acid-etched LDPE, polyhydroxyetherimide (PHEI), butylated silica and LDPE oxidized with phase-transferred permanganate. The strength of adhesion measured as the force required to peel off the laminated aluminium foil by 180 ° is found to be a function of time of etching, blend composition and the effective amount of polar groups on polymer-metal interface. LDPE-based additives, e.g. chromic acid oxidised LDPE and LDPE oxidised under phase transfer catalysis in benzene, promote practical adhesion by factors of 8 and 16, respectively. In the case of the silane additive there is virtually no enhancement of the peel load despite a large number of polar groups present in the blend. The results can be interpreted in terms of cohesive failure.
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