Adhesion and Bonding to Polyolefins (Rapra Review Reports) by D. M. Brewis, I. Mathieson

By D. M. Brewis, I. Mathieson

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AFM indicates that a nodular surface topography is generated during the flame oxidation of the PP. The surface topographical features generated by flame treatment are © Copyright 2002 Rapra Technology Limited References and Abstracts probably the result of the agglomeration of intermediatemolecular-weight materials. 51 refs. 1358-64 SELF-ADHESION OF POLYETHYLENE IN THE MELT. I. 5-25 s, and the peel strength determined at the sealing temperature, using various peel rates, to study the molecular mechanisms and kinetics of self-adhesion in copolymers with broad molecular weight distributions.

The length of the treatment and the neutralisation procedure (with and without ammonium hydroxide) were considered. The treatment with sulphuric acid resulted in the sulphonation of the butadiene units of the rubber and the creation of highly conjugated C:C bonds, which produced a change in colour of the thermoplastic elastomers. The treatment also produced a decrease in the TS and the EB of the rubbers. This indicated that the treatment with sulphuric acid was not restricted to the rubber surface but also produced a bulk modification.

The time to achieve maximum strength was shorter for the copolymer with a more homogeneous composition, although the maximum strength was the same for all copolymers for a given test temperature. The saturation time for all copolymers was 2 orders of magnitude longer than the time for complete interdigitation of the surface chains. This was attributed to the presence of a surface layer of low molecular weight, higher branch content copolymer. 46 refs. 11-8 ADHESIVE BEHAVIOR OF UV SENSITIZER MODIFIED LOW-DENSITY POLYETHYLENE Novak I; Chodak I Slovak Academy of Sciences The adhesive behaviour of PE (Bralen RA 2-19 from Slovnaft) modified by UV irradiation and phosphoryl chloride was investigated.

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