Adhesion of Polymers by Vladimir Kestelman, Roman Veslovsky

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By Vladimir Kestelman, Roman Veslovsky

If you would like a common knowing of polymer adhesion, this ebook isn't for you. it truly is for the complex reader and is overestimated!

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The surface tension of the reactive blend changes while the reaction runs. Once the reaction is completed the system comes eventually to a state that corresponds to equilibrium. It must be borne in mind that actual (thermodynamic) equilibrium cannot be achieved in some simulated systems, which is why by ‘‘equilibrium systems’’ we mean systems (as in this particular case) in which the surface tension changes very slowly. Let us consider the general regularities of the change in surface tension as the system polymerizes.

95. The experiments obtained the dependence of the modulus of elasticity of the epoxy coating on its thickness within limits of 1–100 mm as presented in Fig. 6. The tested coating was applied to the aluminum and polyethylene terephthalate surfaces of the substrate. It is evident that decreasing the coating thickness down to about 10 mm has a slight effect on the value of the modulus of elasticity of the epoxy coating, independently of the nature and the energy field of the substrate surface. Apparently, the modulus of elasticity of the polymeric coating in this range of thickness corresponds to that for this material in bulk, where the contribution of the boundary layer is not practically exhibited.

In calculating the molecular weight of the reaction products one can assume that with high probability there is no interaction between the reaction products and OAA, because of the great excess of the reactive epoxy groups in the system. In our case the molar ratio of OAA to DEG-1 did not exceed 16:7 Â 10À3 . 5–2 times when there is surfactant branching. 3 presents the colloid-chemical characteristics of OAA and of PR; it is evident that, although PR themselves are surfactants, their micellar mass is substantially less than that of OAA.

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