New PDF release: Activated Carbon

By Hassler J.W.

ISBN-10: 2622782659

ISBN-13: 9782622782656

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Extra resources for Activated Carbon

Sample text

The dependence obtained for the coating modulus of elasticity on the coating thickness in the region of slight thickness concurs with the existence of the gradient of the structural and the segmental mobility in polymers close to the boundary with the solid surface. The increase of the modulus of elasticity of the epoxy coating when applied to a substrate in line with the decrease of its thickness can be related not only to the energy and entropy effects of the substrate on the process of the structure formation and on the final structure of the polymer boundary layers but also to the effect of the adhesion interaction on the process of their deformation together with the substrate [85–89], which results in effects of combined strengthening and increase of deformability of polymeric films.

Experimentally these processes were studied on the DEG–PEPA system with added OP-10, DDN, and L-19. The system was polymerized at 20, 40, and 608C. The temperature change noticeably affects the character of the surface tension isotherms. The surface tension of systems polymerized at 208C changes gradually (see Fig. 13), while an increase in temperature results in the appearance of maxima on the isotherms (see Fig. 14). This difference in the path of the curves is explained by the fact that at low temperature, when the rate of polymerization is low, the state of aggregation of surfactant molecules falls into line with the state of the polymerizing solvent, which is demonstrated by the coincidence of the values of the surface tension determined under the equilibrium and dynamic conditions in the course of system polymerization.

In this case the lower values of the modulus of elasticity of the epoxy coatings on the high-energy substrate compared with the moduli for coatings on the low-energy substrate at coating thicknesses of 2–20 mm can be explained by a small contribution to the elasticity of the coating of the weak boundary layers [94, 95] formed, in line with formation of the polymer on the high-energy surface. A screening effect is also possible, which decreases the range of transmission of the externally fed deformation energy from the solid surface of the higher-modulus substrate to the boundary layer and farther to more remote layers of the polymeric coating via adhesion bonds.

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Activated Carbon by Hassler J.W.


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