Adhesion of Polymers by Vladimir Kestelman, Roman Veslovsky

By Vladimir Kestelman, Roman Veslovsky

If you'd like a common realizing of polymer adhesion, this publication isn't really for you. it's for the complicated reader and is overvalued!

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Adhesive Properties Control by Surface-Active Substances 41 ‘‘pre-associations’’ produces only a small advantage of the free energy that does not compensate the increase of the system surface tension due to the desorption of surfactant molecules. The formation of micelles at epoxy groups conversion level above 20–30% or at surfactant concentration over 40 kg/m3 produces a large free energy advantage that causes the decrease of the surface tension along with the increase of the conversion level (see Fig.

The surface tension of the system increases with increase of the concentration of urethane groups; DDN is not surface active with respect to POPT. The surface activity develops with the increase of the concentration of urethane groups (see Fig. 9). It seems to be caused by the decline of the solubility of DDN in the oligomer. With the increase of urethane group content, CCMF decreases, and this decrease is most abrupt in the region of considerable degrees of conversion of the system. A similar phenomenon was observed for the epoxy resin: the closer the system is to the gelformation point, the worse is the surfactant solubility in it.

26 By Estimated CCMFPR (mol/m3 ) 38 Chapter Two increase of the surfactant solubility. 7) decreases 150–170 times. This results in a decrease of the surfactant excess adsorption that causes increase of the solution surface tension. When the surfactant concentration in the system is higher than CCMF, the disintegrating micelles of OAA serve as a source of surface-active molecules. 4), the absolute adsorption attainable also increases because of the increase of CCMF; that is, by increasing the PR concentration in the system one can achieve greater decrease of the surface tension than with OAA despite the much lower surface activity of PR.

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