Adhesion energy between polymer networks and solid surfaces modified by polymer attachment

Rate-Dependent Adhesion between Opposed Perfluoropoly(alkyl ether) Layers: Dependence on Chain-End Functionality and Chain Length

“…4 However, in the experiments on elastomer, the adhesion depended on rate even at the slowest separation rates. The difference might reflect the longer contact times (1 h 4 ) in those experiments.…”

“…This has been noticed independently in several disciplines with conflicting explanations: in the study of bioreceptor interactions, where it has been attributed to rate-dependent shifts in the dependence of potential energy on surface separation, 1,2 and in polymer adhesion, where it has been attributed in some instances to pullout of chains that had become entangled in opposed polymer networks 3,4 but in most cases to energy dissipation within the bulk of the polymer rather than at its surface. [5][6][7][8][9] Some approaches to analyze rate dependence separate the adhesion into the product of a term proportional to the surface energy and a second term proportional to viscoelastic losses in the underlying bulk material.…”

“…The technique has been extended to studies of the effects of contact time and separation rate on the adhesion between an elastomer cap and a surface covered with grafted polymer chains that penetrate into the elastomer network. 3,4 Theoretical models 20,21 for such systems, based on the elastic energy and contact area of the penetrating chains being pulled out of the network, predict a linear increase in apparent adhesion or "interfacial toughness" as the separation rate is increased. This has been observed experimentally in some studies, 3 while in other experiments, 4 the response was found to be strongly nonlinear.…”

“…3,4 Theoretical models 20,21 for such systems, based on the elastic energy and contact area of the penetrating chains being pulled out of the network, predict a linear increase in apparent adhesion or "interfacial toughness" as the separation rate is increased. This has been observed experimentally in some studies, 3 while in other experiments, 4 the response was found to be strongly nonlinear. A limitation is that when viscoelastic or time-dependent observations are obtained on these systems, it is ambiguous whether the result is an effect of events at the surface or within the underlying bulk material.…”

Impact of Solvent Quality on the Density Profiles of Looped Triblock Copolymer Brushes by Neutron Reflectivity Measurements

“…[1][2][3][4][5][6][7] Interface modification using tethered polymer brushes is relevant across a broad range of applications, including colloid stabilization, 8 adhesion, [9][10][11] biomaterial interfaces, lubrication, 12 and wetting. Much experimental, theoretical, and simulation work has been directed toward understanding the fundamental aspects of these tethered chains, including the adsorption kinetics and the conformation of tethered polymer chains at surfaces.…”