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Abstract
Development of self-adhesion above the melting temperature was studied in a group of linear low-density polyethylenes. An experimental procedure for consecutively sealing and peeling a polymeric film at the same temperature, above the melting point, was developed. This made it possible to measure melt adhesion over a wide range of temperatures, seal times, and peel rates. Taking advantage of the new experimental technique, the molecular mechanisms and kinetics of self-adhesion in heterogeneous ethylene copolymers with broad molecular weight distribution were investigated. It was found that the peel strength increased with the contact time in accordance with the conventional t1/2 dependence until saturation at the maximum strength. The time to achieve maximum strength was significantly shorter for the copolymer with more homogeneous copolymer composition; however, the maximum strength was the same for all the materials at each test temperature. The saturation time in all cases was 2 orders of magnitude lon...
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