2018/07/30 by Julien Chopin, Richard Villey, Julien, Chopin +10
Materials Science · Chemistry · #Polymer crystallization and properties #Advanced Polymer Synthesis and Characterization #biodegradable polymer synthesis and properties
paper · pdf · doi:10.48550/arxiv.1807.11312
We investigate experimentally the adherence energy \Γ of model\npolyacrylate Pressure Sensitive Adhesives (PSAs) with combined large strain\nrheological measurements in uniaxial extension and an instrumented peel test.\nWe develop a nonlinear model for such peel test which captures the dependence\nof \Γ(V) with peeling rate V revealing the key role played by the\nextensional rheology. Our model explains in particular why traditional linear\nviscoelastic approaches correctly predict the slope of \Γ(V) curves for\nsufficiently elastic PSAs characterized by a simple rate-independent debonding\ncriterion. However, for more viscoelastic adhesives, we identified a more\ncomplex rate-dependent debonding criterion yielding a significant modification\nof the \Γ(V) curves, an effect that has been largely overlooked so far.\nThis investigation opens the way towards the understanding of fibrils\ndebonding, which is the main missing block to predict the adherence of PSAs.\n