| http://www.w3.org/ns/prov#value | - Polyolefins such as polyethylene and polypropylene are often grafted with maleic anhydride to produce polar functionalized polymers and have proven to be effective as a tie-layer or adhesion promoter for bonding non-polar polypropylene or polyethylene to a polar polymer such as EVOH. The amount of grafting can control the effectiveness of the tie-layer, i.e. the higher the amount of anhydride graf
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