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By D. M. Brewis, I. Mathieson

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Extra info for Adhesion and Bonding to Polyolefins (Rapra Review Reports)

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Two organofunctional silanes and a functionalised propylene-maleic anhydride copolymer were used to improve the interfacial adhesion in glass fibre polypropylene reinforced composites. The performance of the glass coupling agents was evaluated by the measurement of mechanical properties, scanning electron microscopy and dynamic mechanical thermal analysis. Scanning electron microscopy observations indicated increased adhesion which was confirmed by the improved properties achieved during mechanical testing.

35 refs. ; Colorado,University Contact-angle measurements, atomic force microscopy and X-ray photoelectron spectroscopy are used to characterise flame treated biaxially oriented PP films. While the surface of PP treated in a fuel-lean flame is highly oxidised, no water-soluble low-molecular-weight oxidised material is formed by the flame treatment. A new computational model, SPIN, is used to determine the chemical composition of the impinging flames used to modify the PP. The SPIN model indicates that the species primarily responsible for the surface oxidation of the PP are OH, HO2, H2O2 and O2.

Conference proceedings. Ltd. (SPE) It has previously been proposed that oxidation of linear low density polyethylene, by heating the polymer to high temperatures, enhances the adhesion to polar substrates such as aluminium foil during the extrusion coating process. The peel strength increases with increasing time in the air gap, attributed to increased oxidation of the melt curtain. Acid copolymers behave similarly. Experiments were conducted to clarify the mechanism: acid copolymers and LDPE were treated with ozone as they were coated onto foil, and the peel strength determined; the influence of antioxidant additions to the peel strength of LDPE was studied; the influence of processing temperature on peel strength was evaluated; and the influence of orientation on peel strength was measured.

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