By Istvan Benedek, Mikhail M. Feldstein
Discussing the definition of strain sensitivity and characterization of pressure-sensitive habit, quantity 1 of the guide of Pressure-Sensitive Adhesives and items offers the underlying thought in the back of the most standards of strain sensitivity, together with Dahlquist criterion, loose quantity idea, and traumatic inflammation thought, and the pressure-sensitive functionality features outlined by way of tack, peel resistance, and shear resistance. It describes the chemical and macromolecular foundation of strain sensitivity as made up our minds via molecular mobility and its parameters and molecular constitution and its legislation. The e-book additionally addresses the actual and mechanical foundation of strain sensitivity in addition to the mechanical houses of pressure-sensitive adhesives and items that correlate to their adhesive, changing, and end-use functionality features.
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Extra resources for Fundamentals of Pressure Sensitivity
The maximum relaxation time of the supramolecular structure can be considered as a characteristic time measure of the PSA’s adhesive failure. Chapter 11 demonstrates that it is the maximum relaxation time that governs the adhesive strength of various PSAs. It is therefore reasonable to express the contact time in values normalized by the maximum relaxation time of the tested material. External mechanical stresses decrease the value of the activation barrier; therefore, the durability of adhesive joints also depends on the applied stress.
The spreading of drops on gels surfaces requires additional energy to overcome a viscous dissipation of the substrate [32–40]. 11) surfaces. A similar result was obtained in Ref. 1 MPa), it takes 1 h for the drop to reach the equilibrium state. The difference in spreading rate on soft and rigid surfaces is more pronounced for lowviscosity liquids than for high-viscosity liquids. Thus, as discussed previously, spreading water on a gel proceeds much more slowly than on a rigid surface. 15 illustrate that PI and PEG-400 do not demonstrate a significant decrease in spreading rate on the gel surface.
Instabilities during wetting process. Wetting by tensioactive liquids. J. Colloid and Interface Sci. 126:84–92. 23. , Hallstensson K. 2000. Dynamic of capillary rise. J. Colloid and Interface Sci. 228:263–269. indd 23 8/16/2008 5:08:20 PM 1-24 Fundamentals of Pressure Sensitivity 24. D. 2001. Reverse flow of mixed surfactant solutions after their capillary rise. Colloid Journal. 63:769–773. 25. , Garoff S. 1995. Origins of the complex motion of advancing surfactant solutions. Langmuir. 11:87–92.
Fundamentals of Pressure Sensitivity by Istvan Benedek, Mikhail M. Feldstein